The four-celled female gametophyte of Illicium (Illiciaceae; Austrobaileyales): Implications for understanding the origin and early evolution of monocots, eumagnoliids, and eudicots

American Journal of Botany

Volumn 91, Issue 3, 2004, Pages 332-351

  Williams, Joseph H ^a   Friedman, William E ^b  

^a UNIVERSITY OF TENNESSEE   (United States)

^b UNIVERSITY OF COLORADO   (United States)

Author keywords

Ancestral character state reconstruction; Evolution of development; Female gametophyte; Heterotopy; Illicium; Modularity; Origin of angiosperms; Triploid endosperm

Indexed keywords

EVOLUTION;

AMBORELLACEAE; AUSTROBAILEYALES; ILLICIUM; ILLICIUM MEXICANUM; LILIOPSIDA; MAGNOLIOPHYTA; NYMPHAEALES; POLYGONUM; SCHISANDRACEAE; SPERMATOPHYTA;

EID: 1642276427     PISSN: 00029122     EISSN: None     Source Type: Journal    
DOI: 10.3732/ajb.91.3.332     Document Type: Article

References (281)

1. AFZELIUS, K. 1920. Einige Beobachtungen über die Samenentwicklung der Aponogetonaceae. Svensk Botanisk Tidskrift 14: 168-175.
2. AGRAWAL, J. S. 1952. The embryology of Lilaea subulata H. B. K. with a discussion on its systematic position. Phytomorphology 2: 15-29.
3. APG II. 2003. An update of the Angiosperm Phylogeny Group classification of the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141: 399-436.
4. AZUMA, H., J. G. GARCIÁ-FRANCO, V. RICO-GRAY, AND L. B. THIEN. 2001. Molecular phylogeny of the Magnoliaceae: the biogeography of tropical and temperate disjunctions. American Journal of Botany 88: 2275-2285.
5. BAMBACCIONI-MEZZETTI, V. 1935. Richerche morfologiche sulle Lauraceae. Lo sviluppo dell'ovulo e dei sacchi pollinici nel Laurus nobilis L. Annali Botanica (Roma) 21: 1-19.
6. BATTAGLIA, E. 1951. The male and female gametophytes of angiosperms - an interpretation. Phytomorphology 1: 87-116.
7. BATTAGLIA, E. 1986. Embryological questions: 7. Do new types of embryo sac occur in Schisandra? Annali di Botanica (Roma) 44: 69-82.
8. BATTAGLIA, E. 1989. The evolution of the female gametophyte of angiosperms: an interpretative key. (Embryological Questions: 14). Annali di Botanica (Roma) 47: 7-144.
9. BATYGINA, T. B. 1994. Embryology of flowering plants. Russian Academy of Sciences, St. Petersburg, Russia.
10. BATYGINA, T. B., G. E. KOLESOVA, AND V. E. VASIUEVA. 1983. Embryology of the Nymphaeales and Nelumbonales III. Embryogenesis of Nelumbo nucifera. Botanicheskii Zhurnal 68: 311-317.
11. BATYGINA, T. B., I. I. SHAMROV, AND G. E. KOLESOVA. 1982. Embryology of the Nymphaeales and Nelumbonales II. The development of the female embryonic structures. Botanicheskii Zhurnal 67: 1179-1195.
12. BERG, R. Y. 1967. Megagametogenesis and seed development in Dendromecon rigida (Papaveraceae). Phytomorphology 17: 223-233.
13. BHANDARI, N. N. 1963a. Embryology of Pseudowintera colorata - a vessel-less dicotyledon. Phytomorphology 13: 303-316.
14. BHANDARI, N. N. 1963b. Studies in the family Ranunculaceae V. The female gametophyte of Adonis aestivalis L. - a reinvestigation. Phytomorphology 13: 317-320.
15. BHANDARI, N. N. 1965. Studies in the family Ranunculaceae VIII. Variations in the development of the embryo sac of Anemone vitifolia Buch.-Ham. ex DC. Phytomorphology 15: 285-291.
16. BHANDARI, N. N. 1966. Studies in the family Ranunculaceae IX. Embryology of Adonis Dill. ex Linn. Phytomorphology 16: 578-587.
17. BHANDARI, N. N. 1968. Studies in the family Ranunculaceae X. Embryology of Anemone L. Phytomorphology 18: 487-497.
18. BHANDARI, N. N. 1971. Embryology of the Magnoliales and comments on their relationships. Journal of the Arnold Arboretum 52: 1-39, 285-304.
19. BHANDARI, N. N., AND R. N. KAPIL. 1964. Studies in the family Ranunculaceae VII. Two types of embryo sacs in Trollius Linn. Beiträge zur Biologie der Pflanzen 40: 113-120.
20. BHANDARI, N. N., AND R. VENKATARAMAN. 1968. Embryology of Drimys winteri. Journal of the Arnold Arboretum 49: 509-524.
21. BHANDARI, N. N., AND M. R. VIJAYARAGHAVAN. 1970. Studies in the family Ranunculaceae XII. Embryology of Aquilegia vulgaris. Beiträge zur Biologie der Pflanzen 46: 337-354.
22. BHATNAGAR, S. P. 1965. Some observations on the embryology of Holboellia latifolia Wall. Current Science 34: 28-29.
23. BOUMAN, F. 1985. Embryology (Aponogetonaceae). Bibliotheca Botanica 137: 4-9.
24. BRINK, R. A., AND D. C. COOPER. 1947. The endosperm in seed development. Botanical Review 13: 423-477.
25. BROFFERIO, I. 1930. Osservazioni sullo sviluppo delle Calycanthaceae. Annali di Botanica (Roma) 18: 387-394.
26. BUELL, M. F. 1938. Embryogeny of Acorus calamus. Botanical Gazette 99: 556-568.
27. CAMPBELL, D. H. 1899. Notes on the structure of the embryo-sac in Sparganium and Lysichiton. Botanical Gazette 27: 153-166.
28. CAMPBELL, D. H. 1900. Studies on the Araceae. Annals of Botany 14: 1-25.
29. CAMPBELL, D. H. 1905. Studies on the Araceae, III. Annals of Botany 19: 329-347.
30. CARPUTO, D., L. FRUSCIANTE, AND S. J. PELOQUIN. 2003. The role of 2n gametes and endosperm balance number in the origin and evolution of polyploids in the tuber-bearing Solanums. Genetics 163: 287-294.
31. CHANDERBALI, A. S., H. VAN DER WERFF, AND S. S. RENNER. 2001. Phylogeny and historical biogeography of Lauraceae: evidence from the chloroplast and nuclear genomes. Annals of the Missouri Botanical Garden 88: 104-134.
32. CHIARUGI, A. 1927. Il gametofito femmineo delle angiosperme nei suoi vari tipi di costruzione e di sviluppo. Nuovo Giornale Botanico Italiano Nuova Serie 34: 1-133.
33. CHODAT, R. 1916. La végétation du Paraguay III. Hydnoracées. Bulletin de la Société Botanique de Genêve 8: 186-201.
34. COCCUCI, A. E. 1973. Some suggestions on the evolution of gametophytes of higher plants. Phytomorphology 23: 109-124.
35. COY, G. V. 1928. Morphology of Sassafras in relation to the phylogeny of angiosperms. Botanical Gazette 80: 149-170.
36. CRONQUIST, A. 1988. The evolution and classification of flowering plants, 2nd ed. New York Botanical Garden, New York, New York, USA.
37. DAHLGREN, G. 1993. Ranunculus penicillatus in Norden. Nordic Journal of Botany 13: 593-605.
38. DAHLGREN, K. V. O. 1928. Die Embryologie einiger Alismatazeen. Svensk Botanisk Tidskrift 22: 1-17.
39. DAHLGREN, K. V. O. 1934. Die Embryosackentwicklung von Echinodorus macrophyllus und Sagittaria sagittifolia. Planta 127: 273-330.
40. DAHLGREN, K. V. O. 1939. Endosperm-und Embryobildung bei Zostera marina. Botaniska Notiser 1939: 607-615.
41. D'AMATO, F. 1984. Role of polyploidy in reproductive organs and tissues. In B. M. Johri [ed.], Embryology of angiosperms, 518-566. Springer-Verlag, Berlin, Germany.
42. DASTUR, R. H. 1922. Notes on the development of the ovule, embryo sac and embryo of Hydnora africana, Thunb. Transactions of the Royal Society of South Africa 9: 27-31.
43. DAVIS, G. L. 1966. Systematic embryology of the angiosperms. John Wiley and Sons, New York, New York, USA.
44. DONOGHUE, M. J., AND S. M. SCHEINER. 1992. The evolution of endosperm: a phylogenetic account. In R. Wyatt [ed.], Ecology and evolution of plant reproduction, 356-389. Chapman and Hall, New York, New York, USA.
45. DOYLE, J. A. 2000. Paleobotany, relationships, and geographic history of Winteraceae. Annals of the Missouri Botanical Garden 87: 303-316.
46. DOYLE, J. A., AND P. K. ENDRESS. 2000. Morphological phylogenetic analysis of basal angiosperms: comparison and combination with molecular data. International Journal of Plant Sciences 161: S121-S153.
47. DOYLE, J. A., AND A. LETHOMAS. 1997. Phylogeny and geographic history of Annonaceae. Géographie Physique et Quaternaire 51: 353-361.
48. EARLE, T. T. 1938. Embryology of certain Ranales. Botanical Gazette 100: 257-275.
49. EDWARDS, J. G. 1920. Flower and seed of Hedyosmum nutans. Botanical Gazette 70: 409-424.
50. EHDAIE, M., AND S. D. RUSSELL. 1984. Megagametophyte development of Nandina domestica and its taxonomic implications. Phytomorphology 34: 221-225.
51. ENDRESS, P. K. 1969. Gesichtspunkte zur systematischen Stellung der Eupteleaceen (Magnoliales). Berichte der Schweizerischen Botanischen Gesellschaft 79: 229-278.
52. ENDRESS, P. K. 1972. Zur vergleichenden Entwicklungsmorphologie, Embryologie und Systematik bei Laurales. Botanische Jahrbücher für Systematik 92: 331-428.
53. ENDRESS, P. K. 1980a. The reproductive structures and systematic position of the Austrobaileyaceae. Botanische Jahrbücher für Systematik 101: 393-433.
54. ENDRESS, P. K. 1980b. Floral structure and relationships of Hortonia (Monimiaceae). Plant Systematics and Evolution 133: 199-221.
55. ENDRESS, P. K., AND A. IGERSHEIM. 2000. Gynoecium structure and evolution in basal angiosperms. International Journal of Plant Sciences 161: S211-S223.
56. ENDRESS, P. K., AND F. B. SAMPSON. 1983. Floral structure and relationships of the Trimeniaceae (Laurales). Journal of the Arnold Arboretum 64: 447-473.
57. ERBRICH, P. 1965. Uber Endopolyploidie und Kernstrukturen in Endospermhaustorien. Oesterreichische Botanische Zeitschrift 112: 197-262.
58. ERNST, A. 1908. Ergebnisse neuerer Untersuchungen über den Embryosack der Angiospermen. Verhandlungen der Schweizerischen Naturforschenden Gesellschaft 91(1): 230-263.
59. FAVRE-DUCHARTRE, M. 1977. Eight interpretations of the embryo sac. Phytomorphology 27: 407-418.
60. FAVRE-DUCHARTE, M. 1984. Homologies and phylogeny. In B. M. Johri [ed.], Embryology of angiosperms, 697-734. Springer-Verlag, Berlin, Germany.
61. FERNANDO, D. D., AND D. D. CASS. 1996. Development and structure of ovule, embryo sac, embryo, and endosperm in Butomus umbellatus (Butomaceae). International Journal of Plant Sciences 157: 269-279.
62. FLOYD, S. K., AND W. E. FRIEDMAN. 2000. Evolution of endosperm developmental patterns among basal flowering plants. International Journal of Plant Sciences 161: S57-S81.
63. FLOYD, S. K., AND W. E. FRIEDMAN. 2001. Developmental evolution of endosperm in basal angiosperms: evidence from Amborella (Amborellaceae), Nuphar (Nymphaeaceae), and Illicium (Illiciaceae). Plant Systematics and Evolution 228: 153-169.
64. FLOYD, S. K., V. T. LERNER, AND W. E. FRIEDMAN. 1999. A developmental and evolutionary analysis of embryology in Platanus (Platanaceae), a basal eudicot. American Journal of Botany 86: 1523-1537.
65. FOSTER, A. S., AND E. M. GIFFORD. 1974. Comparative morphology of vascular plants. Freeman, San Francisco, California, USA.
66. FRENCH, J. C., M. CHUNG, AND Y. HUR. 1995. Chloroplast DNA phylogeny of Ariflorae. In P. J. Rudall, P. J. Cribb, D. F. Cutler, and C. J. Humphries [eds.], Monocotyledons: systematics and evolution, 255-275. Royal Botanic Gardens, Kew, UK.
67. FREY, L. 1966. Embryological studies on Alisma lanceolatum With. Acta Biologica Cracoviensia Series Botanica 9: 125-139.
68. FRIEDMAN, W. E. 2001. Developmental and evolutionary hypotheses for the origin of double fertilization and endosperm. Comptes Rendus de l'Académie des Sciences - Series III - Sciences de la Vie 324: 559-567.
69. FRIEDMAN, W. E., AND J. S. CARMICHAEL. 1998. Heterochrony and developmental innovation: evolution of female gametophyte ontogeny in Gnetum, a highly apomorphic seed plant. Evolution 52: 1016-1030.
70. FRIEDMAN, W. E., AND S. K. FLOYD. 2001. Perspective: the origin of flowering plants and their reproductive biology - a tale of two phylogenies. Evolution 55: 217-231.
71. FRIEDMAN, W. E., W. N. GALLUP, AND J. H. WILLIAMS. 2003. Female gametophyte development in Kadsura: implications for Schisandraceae, Austrobaileyales, and the early evolution of flowering plants. International Journal of Plant Sciences 164(5): S293-S305.
72. FRIEDMAN, W. E., AND J. H. WILLIAMS. 2003. Modularity of the angiosperm female gametophyte and its bearing on the early evolution of endosperm in flowering plants. Evolution 57: 216-230.
73. FRIIS, E. M., K. R. PEDERSEN, AND P. R. CRANE. 1999. Early angiosperm diversification: the diversity of pollen associated with reproductive structures in early Cretaceous floras from Portugal. Annals of the Missouri Botanical Garden 86: 259-296.
74. GALATI, B. G. 1985. Estudios embriológicos en Cabomba australis (Nymphaeaceae) I. La esporogenesis y las generaciones sexuadas. Boletín de la Sociedad Argentina de Botanica 24: 29-47.
75. GONZÁLEZ, F., P. J. RUDALL, AND C. A. FURNESS. 2001. Microsporogenesis and systematics of Aristolochiaceae. Botanical Journal of the Linnean Society 137: 221-242.
76. GOVINDAPPA, D. A., AND T. R. B. NAIDU. 1956. The embryo sac and endosperm of Blyxa oryzetorum Hook. f. Journal of the Indian Botanical Society 35: 417-422.
77. GRAHAM, S. W., AND R. G. OLMSTEAD. 2000. Utility of 17 chloroplast genes for inferring the phylogeny of the basal angiosperms. American Journal of Botany 87: 1712-1730.
78. GRAHAM, S. W., P. A. REEVES, A. C. E. BURNS, AND R. G. OLMSTEAD. 2000. Microstructural changes in noncoding chloroplast DNA: interpretation, evolution, and utility of indels and inversions in basal angiosperm phylogenetic inference. International Journal of Plant Sciences 161: S83-S96.
79. GRAVES, A. H. 1908. The morphology of Ruppia maritima. Transactions of the Connecticut Academy of Sciences New Haven 14: 59-170.
80. GROSSNIKLAUS, U., J.-P. VIELLE-CALZADA, M. A. HOEPPNER, AND W. B. GAGLIANO. 1998. Maternal control of embryogenesis by MEDEA, a polycomb group gene in Arabidopsis. Science 280: 446-450.
81. GUPTA, B. L. 1934. A contribution to the life history of Potamogeton crispus L. Journal of the Indian Botanical Society 13: 51-65.
82. GUPTA, S. C., AND R. AHLUWALIA. 1979. The anther and ovule of Nelumbo nucifera - a reinvestigation. Journal of the Indian Botanical Society 58: 177-182.
83. GVALADZE, G. E. 1983. Formation process of embryo sac in Peperomia rezediflora Linden et Andre. Isvestikila Akademii nauk Gruzins 9: 109-114.
84. GVALADZE, G. E., AND M. S. AKHALKATSI. 1990. Is the Polygonum-type embryo sac primitive? Phytomorphology 40: 331-337.
85. HAIG, D. 1990. New perspectives on the angiosperm female gametophyte. Botanical Review 56: 236-274.
86. HAIG, D., AND M. WESTOBY. 1991. Genomic imprinting in endosperm: its effect on seed development in crosses between species and between different ploidies of the same species, and its implications for the evolution of apomixis. Philosophical Transactions of the Royal Society of London, series B 333: 1-13.
87. HAO, G., M.-L. CHYE, AND R. M. K. SAUNDERS. 2001. A phylogenetic analysis of the Schisandraceae based on morphology and nuclear ribosomal ITS sequences. Botanical Journal of the Linnean Society 135: 401-411.
88. HARLING, G. 1951. Embryological studies in the Compositae. 2. Anthemideae - Chrysantheminae. Acta Horti Bergiani 16: 1-56.
89. HASITSCHKA-JENSCHKE, G. 1959. Vergleichende karyologische Untersuchungen an Antipoden. Chromosoma 10: 229-267.
90. HAYASHI, Y. 1963a. The embryology of the family Magnoliaceae sens. lat. I. Megasporogenesis, female gametophyte and embryogeny of Illicium anisatum L. Science Reports of the Tohoku University Series IV (Biology) 29: 27-33.
91. HAYASHI, Y. 1963b. The embryology of the family Magnoliaceae sens. lat. H. Megasporogenesis, female gametophyte and embryogeny of Schisandra repanda Radlkofer and Kadsura japonica Dunal. Science Reports of the Tohoku University Series IV (Biology) 29: 403-411.
92. HEILBORN, O. 1931. Studies on the taxonomy, geographical distribution and embryology of the genus Siparuna Aubl. Svensk Botanisk Tidskrift 25: 202-227.
93. HEO, K., AND H. TOBE. 1995. Embryology and relationships of Gyrocarpus and Hernandia (Hernandiaceae). Journal of Plant Research 108: 327-341.
94. HEO, K., H. VAN DER WERFF, AND H. TOBE. 1998. Embryology and relationships of Lauraceae (Laurales). Botanical Journal of the Linnean Society 126: 295-322.
95. HOLFERTY, G. M. 1901. Ovule and embryo of Potamogeton natans. Botanical Gazette 31: 339-346.
96. HOOT, S. B., A. CULHAM, AND P. R. CRANE. 1995. The utility of atpB gene sequences in resolving phylogenetic relationships: comparison with rbcL and 18S ribosomal DNA sequences in the Lardizabalaceae. Annals of the Missouri Botanical Garden 82: 194-207.
97. HOOT, S. B., AND A. W. DOUGLAS. 1998. Phylogeny of the Proteaceae based on atpB and atpB-rbcL intergenic spacer region sequences. Australian Systematic Botany 11: 301-320.
98. HOOT, S. B., J. W. KADEREIT, F. R. BLATTNER, K. B. JORK, A. E. SCHWARZBACH, AND P. R. CRANE. 1997. Data congruence and phylogeny of the Papaveraceae s. l. based on four data sets: atpB and rbcL sequences, trnK restriction sites, and morphological characters. Systematic Botany 22: 575-590.
99. HUANG, B.-Q., AND S. D. RUSSELL. 1992. Female germ unit: organization, isolation, and function. International Journal of Cytology 140: 233-293.
100. HUANG, B.-Q., AND W. F. SHERIDAN. 1994. Female gametophyte development in maize: microtubular organization and embryo sac polarity. Plant Cell 6: 845-861.
101. HUANG, B.-Q., AND W. F. SHERIDAN. 1996. Embryo sac development in the maize indeterminate gametophyte1 mutant: abnormal nuclear behavior and defective microtubule organization. Plant Cell 8: 1391-1407.
102. HUSS, H. A. 1906. Beiträge zur mophologie und physiologie der antipoden. Beihefte zum Botanischen Centralblatt 20: 77-174.
103. JOHNSON, D. S. 1914. Studies of the development of the Piperaceae II. The structure and seed-development of Peperomia hispidula. American Journal of Botany 1: 357-397.
104. JOHNSTON, S. A., T. P. M. DEN NIJS, S. J. PELOQUIN, AND R. E. HANNEMAN, JR. 1980. The significance of genic balance to endosperm development in interspecific crosses. Theoretical and Applied Genetics 57: 5-9.
105. JOHRI, B. M. 1935a. Studies in the family Alismaceae. 1. Limnophyton obtusifolium Miq. Journal of the Indian Botanical Society 14: 49-66.
106. JOHRI, B. M. 1935b. Studies in the family Alismaceae 2. Sagittaria sagittifolia L. Proceedings of the National Academy of Sciences, India Section B 1: 340-348.
107. JOHRI, B. M. 1935c. The gametophytes of Berberis nepalensis Spreng. Proceedings of the National Academy of Sciences, India, Section B 1: 640-649.
108. JOHRI, B. M. 1936a. Studies in the family Alismaceae 4. Alisma plantago L., A. plantago-aquatica L. and Sagittaria graminea Mich. Proceedings of the Indian Academy of Sciences, Section B 4: 128-138.
109. JOHRI, B. M. 1936b. The life-history of Butomopsis lanceolata Kunth. Proceedings of the Indian Academy of Sciences, Section B 4: 139-162.
110. JOHRI, B. M. 1938a. The embryo sac of Limnocharis emarginata L. New Phytologist 37: 279-285.
111. JOHRI, B. M. 1938b. The embryo sac of Hydrocleis nymphoides Buchen. Beihefte zum Botanischen Centralblatt 58A: 162-172.
112. JOHRI, B. M. 1963. Female gametophyte. In P. Maheshwari [ed.], Recent advances in the embryology of angiosperms, 69-103. International Society of Plant Morphology, Delhi, India.
113. JOHRI, B. M., K. B. AMBEGAOKAR, AND P. S. SRIVASTAVA. 1992. Comparative embryology of angiosperms. Springer-Verlag, Berlin, Germany.
114. JOHRI, B. M., AND S. P. BHATNAGAR. 1955. A contribution to the morphology and life history of Aristolochia. Phytomorphology 5: 123-137.
115. JOSHI, A. C. 1937. Contributions to the embryology of the Menispermaceae 1. Cocculus villosus D. C. Proceedings of the National Academy of Sciences, India, Section B 5: 57-63.
116. JOSHI, A. C. 1939. Morphology of Tinospora cordifolia, with some observations on the origin of the single integument, nature of synergidae, and affinities of the Menispermaceae. American Journal of Botany 26: 433-439.
117. JUNELL, S. 1931. Die Entwicklungsgeschichte von Circaeaster agrestis. Svensk Botanisk Tidskrift 25: 238-269.
118. KADEREIT, J. W., F. R. BLATTNER, K. B. JORK, AND A. SCHWARZBACH. 1995. The phylogeny of the Papaveraceae sensu lato: morphological, geographical, and ecological implications. Plant Systematics and Evolution 9S: 133-145.
119. KAISER, M., AND S. G. BOYCE. 1962. Embryology of Liriodendron tulipifera L. Phytomorphology 12: 103-109.
120. KAI-YU, P., L. JIAN-HUA, L. AN-MING, AND W. JIE. 1993. The embryology of Tetracentron sinense Oliver and its systematic significance. Cathaya 5: 49-58.
121. KANTA, K. 1962. Morphology and embryology of Piper nigrum L. Phytomorphology 12: 207-211.
122. KAPIL, R. N., AND N. N. BHANDARI. 1964. Morphology of Magnolia Linn. Proceedings of the National Institute of Science India B 30: 245-262.
123. KAPIL, R. N., AND A. K. BHATNAGAR. 1981. Ultrastructure and biology of female gametophyte in flowering plants. International Review of Cytology 70: 291-339.
124. KAPIL., R. N., AND S. JALAN. 1964. Schisandra Michaux - its embryological and systematic position. Botaniska Notiser 117: 285-306.
125. KAROL, K. G., Y. SUH, G. E. SCHATZ, AND E. A. ZIMMER. 2000. Molecular evidence for the phylogenetic position of Takhtajania in the Winteraceae: inference from nuclear ribosomal and chloroplast gene spacer sequences. Annals of the Missouri Botanical Garden 87: 414-432.
126. KIM, Y.-D., AND R. K. JANSEN. 1998. Chloroplast DNA restriction site variation and phylogeny of the Berberidaceae. American Journal of Botany 85: 1766-1778.
127. LAKSHMANAN, K. K. 1961. Embryological studies in the Hydrocharitaceae. I. Blyxa octandra Planch. Journal of the Madras University 31: 133-142.
128. LAKSHMANAN, K. K. 1963a. Embryological studies in the Hydrocharitaceae. III. Halophila ovata Gaudich. Journal of the Indian Botanical Society 42: 15-18.
129. LAKSHMANAN, K. K. 1963b. Embryological studies in the Hydrocharitaceae. III. Nechamandra alternifolia. Phyton 20: 49-58.
130. LAKSHMANAN, K. K. 1965. Embryological studies in the Hydrocharitaceae. IV. Post-fertilization development in Hydrilla venicillata Royle. Phyton 22: 45-50.
131. LAWALRÉE, A. 1952. L'embryologie des Lemnaceae. Observations sur Lemna minor. La Cellule 54: 305-326.
132. LEI, L.-G., Z.-Y. WU, AND H.-X. LIANG. 2002. Embryology of Zippelia begoniaefolia (Piperaceae) and its systematic relationships. Botanical Journal of the Linnean Society 140: 49-64.
133. LES, D. H., AND M. A. CLELAND. 1997. Phylogenetic studies in Alismatidae, II: evolution of marine angiosperms (seagrasses) and hydrophyly. Systematic Botany 22: 443-463.
134. LES, D. H., E. L. SCHNEIDER, D. J. PADGETT, P. S. SOLTIS, D. E. SOLTIS, AND M. ZANIS. 1999. Phylogeny, classification and floral evolution of water lilies (Nymphaeaceae; Nymhaeales): a synthesis of non-molecular, rbcL, matK, and 18S rDNA data. Systematic Botany 24: 28-46.
135. LIN, B.-Y. 1984. Ploidy barrier to endosperm development in maize. Genetics 107: 103-115.
136. LIU, Z., X.-Q. WANG, Z.-D. CHEN, Q. LIN, AND A.-M. LU. 2000. The phylogeny of Schisandraceae inferred from sequence analysis of the nrDNA ITS region. Acta Botanica Sinica 42: 758-761.
137. LOCONTE, H., L. M. CAMPBELL, AND D. W. STEVENSON. 1995. Ordinal and familial relationships of ranunculid genera. Plant Systematics and Evolution Supplement 9: 99-118.
138. LUO, M., P. BILODEAU, E. S. DENNIS, W. J. PEACOCK, AND A. CHAUDHURY. 2000. Expression and parent-of-origin effects for FIS2, MEA, and FIE in the endosperm and embryo of developing Arabidopsis seeds. Proceedings of the National Academy of Sciences, USA 97: 10637-10642.
139. MABBERLY, D. J. 1997. The plant-book, 2nd ed. Cambridge University Press, Cambridge, UK.
140. MADDISON, D., AND W MADDISON. 2000. MacClade 4.0. Sinauer, Palo Alto, California, USA.
141. MAGALLON, S., AND M. J. SANDERSON. 2001. Absolute diversification rates in angiosperm clades. Evolution 55: 1762-1780.
142. MAHESHWARI, P. 1950. An introduction to the embryology of angiosperms. McGraw-Hill, New York, New York, USA.
143. MAHESHWARI, S. C. 1954. The embryology of Wolffia, Phytomorphology 4: 355-365.
144. MAHESHWARI, S. C. 1955. The occurrence of bisporic embryo sacs in angiosperms - a critical review. Phytomorphology 5: 67-99.
145. MAHESHWARI, S. C. 1958. Spirodela polyrrhiza; the link between the aroids and the duckweeds. Nature 181: 1745-1746.
146. MAHESHWARI, S. C., AND R. N. KAPIL. 1963. Morphological and embryological studies on the Lemnaceae. 1. The floral structure and gametophytes of Lemna paucicostata. American Journal of Botany 50: 677-686.
147. MAHESHWARI, S. C., AND P. P. KHANNA. 1956. The embryology of Arisaema wallichianum Hook. F. and the systematic position of the Araceae. Phytomorphology 6: 379-388.
148. MAHESHWARI, S. C., AND N. MAHESHWARI. 1963. The female gametophyte, endosperm and embryo of Spirodela polyrrhiza. Beiträge zur Biologie der Pflanzen 39: 179-188.
149. MAHESHWARI, P, AND B. SINGH. 1943. Studies in the family Alismaceae. 5. The embryology of Machaerocarpus californicus (Torr.) Small. Proceedings of the National Institute of Sciences India B 9: 311-322.
150. MANEVAL, E. 1914. The development of Magnolia and Liriodendron, and a discussion of the primitiveness of the Magnoliaceae. Botanical Gazette 57: 1-31.
151. MATHEWS, S., AND M. J. DONOGHUE. 1999. The root of angiosperm phylogeny inferred from duplicate phytochrome genes. Science 286: 947-950.
152. MATHUR, S. L. 1968. Development of the male and female gametophytes of Calycanthus fertilis Walt. Proceedings of the National Academy of Sciences, India, Section B 34: 323-329.
153. MAURITZON, J. 1935. Zur Embryologie von Peumus boldus. Archivio Botanico 11: 317-327.
154. MAURITZON, J. 1936a. Zur Embryologie der Berberidaceen. Meddelanden Fran Göteborgs Botaniska Tradgard 11: 1-18.
155. MAURITZON, J. 1936b. Zur Embryologie und systematischen Abgrenzung der Reihen Terebinthales und Celastrales. Botaniska Notiser 14: 161-212.
156. MAYO, S. J., J. BOGNER, AND P. C. BOYCE. 1997. The genera of Araceae. Royal Botanic Gardens, Kew, UK.
157. MCLEAN, R. C., AND W. R. IVIMEY-COOK. 1956. Textbook of theoretical botany. John Wiley and Sons, New York, New York, USA.
158. MENG, S. W., Z. D. CHEN, D. Z. LI, AND H. X. LIANG. 2002. Phylogeny of Saururaceae based on mitochondrial matR gene sequence data. Journal of Plant Research 115: 71-76.
159. MÜCKE, M. 1908. Über den Bau und die Entwicklung der Früchte und über die Herkunft von Acorus calamus L. Botanische Zeitung 66: 1-23.
160. MURBECK, S. 1902. Über die Embryologie von Ruppia rostellata Koch. Kongl. Svenska Vetenskaps-Akademiens Handlingar 36: 1-21.
161. MURTY, Y. S. 1960. Studies in the order Piperales. VIII. A contribution to the morphology of Houttuynia cordata Thumb. Phytomorphology 10: 329-341.
162. NAIR, N. C. 1972. Floral morphology and embryology of Myristica malabarica Lamk. with a discussion of certain aspects of the systematics of Myristicaceae. In Y. S. Murty, B. M. John, H. Y. Mohan Ram, and T. M. Varghese [eds.], Advances in plant morphology, 264-277. Sarita Prakashan, Meerut, India.
163. NAIR, N. C., AND K. R. NARAYANAN. 1961. Studies on the Aristolochiaceae. II. Contribution to the embryology of Bragantia wallichii. Lloydia 24: 199-203.
164. NAUMOVA, T. N. 1979. Ovule, macrosporogenesis, micro-and megagametogenesis in Sarcococca humilis Hort. (Buxaceae). Botanicheskii Zhurnal 63: 635-646.
165. NAUMOVA, T. N. 1981. On the embryology of the representatives of the family Buxaceae. Botanicheskii Zhurnal 66: 1135-1145.
166. NICKRENT, D. L., A. BLARER, Y.-L. QIU, D. E. SOLTIS, P. S. SOLTIS, AND M. ZANIS. 2002. Molecular data place Hydnoraceae with Aristolochiaceae. American Journal of Botany 89: 1809-1817.
167. NIKITICHEVA, Z. I., M. S. YAKOVLEV, AND T. A. PLYUSHCH. 1981. The development of the ovule, embryo sac, and endosperm in the species of Peperomia (Piperaceae). Botanicheskii Zhurnal 66: 1388-1398.
168. ONO, T. 1929. Embryologie der Liliaceae, mit besonderer Rücksicht auf die Endospermbildung. I. Melanthioideae und Aletroideae. Scientific Reports of the Tohoku University IV. Biology. 4: 281-393.
169. ORBAN, I., AND J. BOUHARMONT. 1998. Megagametophyte development of Nymphaea nouchali Burm. f. (Nymphaeaceae). Botanical Journal of the Linnean Society 126: 339-348.
170. PADMANABHAN, D. 1960. A contribution to the embryology of Michelia champaca. Journal of Madras University, series B 30: 155-165.
171. PALSER, B. F. 1975. The bases of angiosperm phylogeny: embryology. Annals of the Missouri Botanical Garden 62: 621-646.
172. PARKINSON, C. L., K. L. ADAMS, AND J. D. PALMER. 1999. Multigene analyses identify the three earliest lineages of extant flowering plants. Current Biology 9: 1485-1488.
173. PARMESWARAN, N. 1962. Floral morphology and embryology in some taxa of the Canellaceae. Proceedings of the Indian Academy of Sciences, Section B 55: 167-182.
174. PERIASAMY, K., AND B. G. L. SWAMY. 1961. Studies in the Annonaceae II. The development of ovule and seed in Cananga odorata and Miliusa wrightiana. Journal of the Indian Botanical Society 40: 206-216.
175. PETER, J. 1920. Zur Entwicklungsgeschichte einiger Calycanthaceen. Beiträge zur Biologie der Pflanzen 14: 59-84.
176. PHILLIPSON, W. R. 1993. Trimeniaceae. In K. Kubitzki, J. G. Rohwer, and V. Bittrich [eds.], The families and genera of vascular plants, 596-599. Springer-Verlag, Berlin, Germany.
177. PLYUSHCH, T. A. 1982. Ultrastructure of Peperomia blanda (Piperaceae): embryo sac. Ukraine Botanicheskii Zhurnal 39: 30-36.
178. PORSCH, O. 1907. Versuch einer phylogenetischen Erklärung des Embryosackes und der doppelten Befruchtung der Angiospermen. Gustav Fischer, Jena, Germany.
179. PRAKASH, N, 1998. An embryological study of Piptocalyx moorei (Trimeniaceae). In B. Bhatia, A. K. Shukla, and H. L. Sharma [eds.], Plant form and function, 272-300. Angkor, New Delhi, India.
180. PRAKASH, N., J. F. BROWN, AND Y.-H. WANG. 1994. An embryological study of Kava, Piper methysticum. Australian Journal of Botany 42: 231-237.
181. PRAKASH, N., D. B. FOREMAN, AND S. J. GRIFFITH. 1984. Gametogenesis in Galbulimima belgraveana (Himantandraceae). Australian Journal of Botany 32: 605-612.
182. PRAKASH, N., A. L. LIM, AND F. B. SAMPSON. 1992. Anther and ovule development in Tasmannia (Winteraceae). Australian Journal of Botany 40: 877-885.
183. QIU, Y.-L., J. LEE, F. BERNASCONI-QUADRONI, D. E. SOLTIS, P. S. SOLTIS, M. ZANIS, E. A. ZIMMER, Z. CHEN, V. SAVOLAINEN, AND M. W. CHASE. 1999. The earliest angiosperms: evidence from mitochondrial, plastid and nuclear genomes. Nature 402: 404-407.
184. QIU, Y.-L., J. LEE, F. BERNASCONI-QUADRONI, D. E. SOLTIS, P. S. SOLTIS, M. ZANIS, E. A. ZIMMER, Z. CHEN, V. SAVOLAINEN, AND M. W. CHASE. 2000. Phylogeny of basal angiosperms: analyses of five genes from three genomes. International Journal of Plant Sciences 161: S3-S27.
185. QUELLER, D. C. 1989. Inclusive fitness in a nutshell. In P. H. Harvey and L. Partridge [eds.], Oxford surveys in evolutionary biology, 73-109. Oxford University Press, Oxford, UK.
186. QUIBELL, C. H. 1941. Floral anatomy and morphology of Anemopsis californica. Botanical Gazette 102: 749-758.
187. RAFF, R. A. 1996. The shape of life. University of Chicago Press, Chicago, Illinois, USA.
188. RAJU, M. V. S. 1952. Embryology of Sabiaceae. Current Science 21: 107-108.
189. RAJU, M. V. S. 1961. Morphology and anatomy of the Saururaceae. I. Floral anatomy and embryology. Annals of the Missouri Botanical Garden 48: 107-124.
190. RENNER, S. S. 1999. Circumscription and phylogeny of the Laurales: evidence from molecular and morphological data. American Journal of Botany 86: 1301-1315.
191. RENNER, S. S. AND A. S. CHANDERBALI. 2000. What is the relationship among Hernandiaceae, Lauraceae, and Monimiaceae, and why is this question so difficult to answer? International Journal of Plant Sciences 161: S109-S119.
192. ROBERTSON, R. E. 1973. An ontogenetic study of Illicium floridanum Ellis with emphasis on stamen and carpel development. Ph.D. dissertation, Louisiana State University, Baton Rouge, Louisiana, USA.
193. ROBERTSON, R. E., AND S. C. TUCKER. 1979. Floral ontogeny of Illicium floridanum, with emphasis on stamen and carpel development. American Journal of Botany 66: 605-617.
194. ROHWER, J. G. 2000. Toward a phylogenetic classification of the Lauraceae: evidence from matK sequences. Systematic Botany 25: 60-71.
195. ROPER, R. B. 1952. The embryo sac of Butomus umbellatus L. Phytomorphology 2: 61-74.
196. ROSENDAHL, C. O. 1909. Embryo-sac development and embryology of Symplocarpus foetidus. Minnesota Botanical Studies 4: 1-9.
197. ROYAL BOTANIC GARDENS, KEW. 2003. Electronic Plant Information Centre, website: www.rbgkew.org.uk/data/ePIC (accessed May, 2003).
198. RUDALL, P. J., AND C. A. FURNESS. 1997. Systematics of Acorus: ovule and anther. International Journal of Plant Sciences 158: 640-651.
199. RUSSELL, S. D. 1993. The egg cell: development and role in fertilization and early embryogenesis. Plant Cell 5: 1349-1359.
200. SACHAR, R. C. 1955. The embryology of Argemone mexicana L. - a reinvestigation. Phytomorphology 5: 200-218.
201. SAKSENA, H. B. 1954. Floral morphology and embryology of Fumaria parviflora Lamk. Phytomorphology 4: 9-17.
202. SAMPSON, F. B. 1969a. Studies on the Monimiaceae I. Floral morphology and gametophyte development of Hedycarya arborea J. R. et G. Forst. (subfamily Monimioideae). Australian Journal of Botany 17: 403-424.
203. SAMPSON, F. B. 1969b. Studies on the Monimiaceae. III. Gametophyte development of Laurelia novae-zelandiae A. Cunn. (subfamily Atherospermoideae). Australian Journal of Botany 17: 425-39.
204. SAMUELS, J. A. 1912. Études sur le développement du sac embryonnaire et sur la fécondation du Gunnera macrophylla B1. Archiv für Zellforsch 8: 52-120.
205. SÂNÉ, Y. K. 1939. A contribution to the embryology of the Aponogetonaceae. Journal of the Indian Botanical Society 18: 79-91.
206. SARGANT, E. 1900. Recent work on the results of fertilization in angiosperms. Annals of Botany 14: 689-712.
207. SASTRI, R. L. N. 1954. Embryological studies in Menispermaceae. Proceedings of the National Academy of Sciences India, Section B 20: 494-502.
208. SASTRI, R. L. N. 1958. Studies in Lauraceae II. Embryology of Cinnamomum and Litsea. Journal of the Indian Botanical Society 37: 266-278.
209. SASTRI, R. L. N. 1962. Studies in Lauraceae. III. Embryology of Cassytha. Botanical Gazette 123: 197-206.
210. SASTRI, R. L. N. 1969. Floral morphology, embryology, and relationships of the Berberidaceae. Australian Journal of Botany 17: 69-79.
211. SCHNARF, K. 1925. Kleine Beiträge zur Entwicklungsgeschichte der Angiospermen. V. Über zwei kritische Fälle der Endospermentwicklung (Verbena und Triglochin). Österreichische Botanische Zeitschrift 1-3: 40-50.
212. SCHNARF, K. 1931. Vergleichende Embryologie der Angiospermen. Gebrüder Borntraeger, Berlin.
213. SCHNARF, K. 1936. Contemporary understanding of embryo sac development among angiosperms. Botanical Review 2: 565-585.
214. SCOTT, R. J., M. SPIELMAN, J. BAILEY, AND H. G. DICKINSON. 1998. Parent-of-origin effects on seed development in Arabidopsis thaliana. Development 125: 3329-3341.
215. SEELIEB, W. 1924. Beiträge zur Entwicklungsgeschichte von Tofieldia calyculata (L.) Wahlenb. Botaniska Notiser 77: 172-178.
216. SHAMROV, I. I. 1998. Formation of hypostase, podium and postament in the ovule of Nuphar lutea (Nymphaeaceae) and Ribes aureum (Grossulariaceae). Botanicheskii Zhurnal 83: 3-14.
217. SMITH, A. C. 1947. The families Illiciaceae and Schisandraceae. Sargentia 7: 1-224.
218. SMIRNOV, A. G., AND L. S. GRAKHANTSEVA. 1988. On the ontogeny of the Peperomia-type embryo sac. Botanicheskii Zhurnal 73: 791-802.
219. SOKOLOWSKA-KULCZYCKA, A. 1980. Embryological studies of Tofieldia calyculata (L.) Whlb. Acta Biologica Cracoviensia series Botanica 22: 113-131.
220. SOLNTSEVA, M. P. 1981. Illiciales. In M. S. Yakovlev [ed.], Comparative embryology of flowering plants, 51-54. Nauka, Leningrad, Russia.
221. SOLTIS, D. E., A. E. SENTERS, M. J. ZANIS, S. KIM, J. D. THOMPSON, P. S. SOLTIS, L. P. RONSE DECRAENE, P. K. ENDRESS, AND J. S. FARRIS. 2003. Gunnerales are sister to other core eudicots: implications for the evolution of pentamery. American Journal of Botany 90: 461-470.
222. SOLTIS, D. E., ET AL. 2000. Angiosperm phylogeny inferred from 18S rDNA, rbcL, and atpB sequences. Botanical Journal of the Linnean Society 133: 381-461.
223. SOLTIS, P. S., D. E. SOLTIS, AND M. W. CHASE. 1999. Angiosperm phylogeny inferred from multiple genes as a research tool for comparative biology. Nature 402: 402-404.
224. STEBBINS, G. L. 1974. Flowering plants: evolution above the species level. Harvard University Press, Cambridge, Massachusetts, USA.
225. STEBBINS, G. L. 1976. Seeds, seedlings, and the origin of angiosperms. In C. B. Beck [ed.], Origin and early evolution of angiosperms, 300-311. Columbia University Press, New York, New York, USA.
226. STELLARI, G. M., M. A. JARAMILLO, AND E. M. KRAMER. In press. Evolution of the APETALA3 and PISTILLATA gene lineages of MADS-box containing genes in the basal angiosperms. Molecular Biology and Evolution.
227. STENAR, H. 1935. Embryologische Beobachtungen über Scheuchzeria palustris L. Botaniska Notiser 13: 78-86.
228. STEVENS, P. F. 2001. Angiosperm phylogeny website. Version 4, May 2003, website: www.mobot.org/MOBOT/research/APweb/.
229. STRASBURGER, E. 1902. Ein Beiträg zur Kenntniss von Ceratophyllum submersum und phylogenetische Erörterungen. Jahrbücher für Wissenschaftliche Botanik 37: 477-526.
230. SVOMA, E. 1998. Studies on the embryology and gynoecium structures in Drimys winteri (Winteraceae) and some Annonaceae. Plant Systematics and Evolution 209: 205-229.
231. SWAMY, B. G. L. 1944. A reinvestigation of the embryo sac of Piper betel L. Proceedings of the National Academy of Sciences, India, Section B 14: 109-113.
232. SWAMY, B. G. L. 1945. The embryo-sac of Heckeria subpeltata Knuth. Journal of the Indian Botanical Society 24: 1-3.
233. SWAMY, B. G. L. 1952. Some aspects in the embryology of Zygogynum bailloni V. Tiegh. Proceedings of the National Institute of Sciences India B 18: 390-406.
234. SWAMY, B. G. L. 1953. Some observations on the embryology of Decaisnea insignis Hook. et Thoms. Proceedings of the National Academy of Sciences, India, Section B 19: 307-310.
235. SWAMY, B. G. L. 1964. Macrogametophytic ontogeny in Schisandra chinensis. Journal of the Indian Botanical Society 43: 391-396.
236. SWAMY, B. G. L., AND I. W. BAILEY. 1949. Further contributions to the morphology of the Degeneriaceae. Journal of the Arnold Arboretum 30: 10-38.
237. SWAMY, B. G. L., AND K. V. KRISHNAMURTHY. 1975. Embryo sac ontogenies in angiosperms - an elucidation. Phytomorphology 25: 12-18.
238. SWAMY, B. G. L., AND K. K. LAKSHMANAN. 1962. Contributions to the embryology of the Najadaceae. Journal of the Indian Botanical Society 41: 247-267.
239. TAKHTAJAN, A. 1976. Neoteny and the origin of flowering plants. In C. B. Beck [ed.], Origin and early evolution of angiosperms, 207-219. Columbia University Press, New York, New York, USA.
240. TAKHTAJAN, A. 1991. Evolutionary trends in flowering plants. Columbia University Press, New York, New York, USA.
241. TOBE, H. 1981. Embryological studies in Glaucidium palmatum Sieb. et Zucc. with a discussion on the taxonomy of the genus. Botanical Magazine, Tokyo 94: 207-224.
242. TOBE, H., T. JAFFRÉ, AND P. H. RAVEN. 2000. Embryology of Amborella (Amborellaceae): descriptions and polarity of character states. Journal of Plant Research 113: 271-280.
243. TOBE, H., AND R. C. KEATING. 1985. The morphology and anatomy of Hydrastis (Ranunculales): systematic reevaluation of the genus. Botanical Magazine, Tokyo 98: 291-316.
244. TOBE, H., AND B. SAMPSON. 2000. Embryology of Takhtajania (Winteraceae) and a summary statement of embryological features for the family. Annals of the Missouri Botanical Garden 87: 389-397.
245. TOBE, H., T. F. STUESSY, P. H. RAVEN, AND K. OGINUMA. 1993. Embryology and karyomorphology of Lactoridaceae. American Journal of Botany 80: 933-946.
246. TRELA-SAWICKA, Z. 1976. Further embryological studies in the genus Anemone L. from Poland. Acta Biologica Cracoviensia series Botanica 19: 83-92.
247. VAN MIEGROET, F., AND M. DUJARDIN. 1992. Cytologie et histologie de la reproduction chez le Nymphaea heudelottii. Canadian Journal of Botany 70: 1991-1996.
248. VENKATA RAO, C. 1960. Studies in the Proteaceae I. Tribe Persoonieae. Proceedings of the Indian Academy of Sciences, Section B 26: 300-337.
249. VENKATA RAO, C. 1965. Studies in the Proteaceae. VI. Tribe Franklandiae. Journal of the Indian Botanical Society 44: 479-494.
250. VENKATA RAO, C. 1966. Studies in the Proteaceae. VIII. Floral morphology, floral anatomy and embryology of Grevillea R. Br. Proceedings of the National Institute of Sciences, India Section B 33: 162-199.
251. VENKATA RAO, C. 1969. Studies in the Proteaceae XI. Morphology, floral anatomy and embryology of Lambertia Sm. with a discussion on the taxonomic position of the genus. Proceedings of the Indian Academy of Sciences, Section B. 48: 11-25.
252. VIJAYARAGHAVAN, M. R. 1962. Studies in the family Ranunculaceae II. The female gametophyte of Clematis gauriana Roxb. Phytomorphology 12: 45-49.
253. VIJAYARAGHAVAN, M. R. 1964. Morphology and embryology of a vesselless dicotyledon - Sarcandra irvingbaileyii Swamy, and the systematic position of Chloranthaceae. Phytomorphology 14: 429-441.
254. VIJAYARAGHAVAN, M. R. 1970. Ranunculaceae. In Symposium on comparative embryology of angiosperms, 45-52. Indian National Science Academy Bulletin, Delhi, India.
255. VIJAYARAGHAVAN, M. R., AND K. N. MARWAH. 1969. Studies in the family Ranunculaceae: morphology and embryology of Nigella damascena. Phytomorphology 19: 147-153.
256. VIJAYARAGHAVAN, M. R., AND A. VIDYA KUMARI. 1974. Embryology and systematic position of Zannichellia palustris L. Journal of the Indian Botanical Society 53: 292-303.
257. VINCENT, M. A. 1997. Illiciaceae. In F. O. N. A. E. Committee [ed.], Flora of North America, 59-61. Oxford University Press, New York, New York, USA.
258. VOLLBRECHT, E., AND S. HAKE. 1995. Deficiency analysis of female gametogenesis in maize. Developmental Genetics 16: 44-63.
259. VON BALTHAZAR, M., P. K. ENDRESS, AND Y.-L. QIU. 2000. Phylogenetic relationships in Buxaceae based on nuclear internal transcribed spacers and plastid ndhF sequences. International Journal of Plant Sciences 161: 785-792.
260. WAGNER, G. P. 1989. The biological homology concept. Annual Review of Ecology and Systematics 20: 51-69.
261. WAGNER, G. P. 1996. Homologues, natural kinds and the evolution of modularity. American Zoologist 36: 36-43.
262. WILLEMSE, M. T. M., AND J. L. VAN WENT. 1984. The female gametophyte. In B. M. Johri [ed.], Embryology of angiosperms, 159-196. Springer-Verlag, Berlin, Germany.
263. WILLIAMS, J. H., AND W. E. FRIEDMAN. 2002. Identification of diploid endosperm in an early angiosperm lineage. Nature 415: 522-526.
264. WINTER, A. N. 1993. Some aspects of the reproductive biology of Hydrostemma longifolium (Barclaya longifolia) (Barclayaceae). Botanicheskii Zhurnal 78: 69-83.
265. WINTER, A. N., AND I. I. SHAMROV. 1991a. Development of the ovule and embryo sac in Nuphar lutea (Nymphaeaceae). Botanicheskii Zhurnal 76: 378-390.
266. WINTER, A. N., AND I. I. SHAMROV. 1991b. Megasporogenesis and embryo sac development in representatives of the genera Nymphaea and Victoria (Nymphaeaceae). Botanicheskii Zhurnal 76: 1716-1728.
267. WYATT, R. L. 1955. An embryological study of four species of Asarum. Journal of the Elisha Mitchell Society 71: 64-82.
268. WYLIE, R. B. 1941. Some aspects of fertilization in Vallisneria. American Journal of Botany 28: 169-174.
269. XI-JIN, M. 1984. Early development of the endosperm in Kingdonia uniflora. Acta Botanica Sinica 26: 668-671.
270. YAKOVLEV, M. S. 1981. Comparative embryology of flowering plants. Winteraceae-Juglandaceae. Nauka, Leningrad, Russia.
271. YOFFE, M. D. 1962. On the embryology of Trochodendron aralioides Sieb. et Zucc.: development of pollen and embryo sac. Trudy Botanicheskogo instituta im. V.L. Komarova Akademii nauk SSSR. Serikila VII, Morfologikilai anatomikila rastenifi 5: 250-259.
272. YORK, H. H. 1904. The embryo-sac and embryo of Nelumbo. Ohio Naturalist 4: 167-172.
273. YOSHIDA, O. 1957. Embryologische Studien über die Ordnung Piperales. I. Embryologie von Chloranthus japonicus Sieb. Journal of the College of Arts and Sciences, Chiba University 2: 172-178.
274. YOSHIDA, O. 1959. Embryologische Studien über die Ordnung Piperales. II. Embryologie von Chloranthus serratus Roem. et Schult. Journal of the College of Arts and Sciences, Chiba University 2: 295-303.
275. YOSHIDA, O. 1960. Embryologische Studien über die Ordnung Piperales. III. Embryologie von Sarcandra glabra Nakai. Journal of the College of Arts and Sciences, Chiba University 3: 55-63.
276. YOSHIDA, O. 1961. Embryologische Studien über die Ordnung Piperales. V. Embryologie von Saururus loureiri. Journal of the College of Arts and Sciences, Chiba University 3: 311-316.
277. YOSHIDA, O. 1962. Embryologische Studien über Schisandra chinensis Bailey. Journal of the College of Arts and Sciences, Chiba University 3: 459-462.
278. YOSHIDA, O., AND A. MICHIKAWA. 1973. Embryological studies of Genus Akebia Decaisne. Journal of the College of Arts and Sciences, Chiba University B 6: 25-37.
279. YOSHIDA, O., AND NAKAJIMA. 1978. Embryological studies of Stauntonia hexaphylla Decne. Journal of the College of Arts and Sciences, Chiba University B 11: 45-57.
280. YOSHIDA, O., AND H. YAMADA. 1973. Embryological studies of Cocculus trilobus DC. Journal of the College of Arts and Sciences, Chiba University B 6: 35-57.
281. ZANIS, M. J., D. E. SOLTIS, P. S. SOLTIS, S. MATHEWS, AND M. J. DONOGHUE. 2002. The root of angiosperms revisited. Proceedings of the National Academy of Sciences, USA 99: 6846-6853.