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''Distephanus'' is a genus of flowering plants in the family Asteraceae.〔Harold E. Robinson. 2007. "Vernonieae" pages 149-174. In: Klaus Kubitzki (series editor); Joachim W. Kadereit and Charles Jeffrey (volume editors). ''The Families and Genera of Vascular Plants'' volume VIII. Springer-Verlag: Berlin; Heidelberg, Germany. ISBN 978-3-540-31050-1〕 It is described by Harold Robinson as having over 40 species 〔 and by David Mabberley as having only 34 species.〔David J. Mabberley. 2008. ''Mabberley's Plant-Book'' third edition (2008). Cambridge University Press: UK. ISBN 978-0-521-82071-4〕 These sources differ sharply in their description of the range of the genus. Robinson has it ranging throughout Africa and occurring also in India and China. Mabberley has it restricted to southeast Africa, Madagascar, and Mauritius. The genus ''Distephanus'' consists of trees, shrubs, and vines. The leaves are often trinervate. The flowers are in terminal inflorescences and are usually yellow. The anthers have an appendage called a tail. The base of the style is enlarged. The name ''Distephanus'' is derived from Greek and means "two crowns", a reference to the two whorls of bristles that form the pappus.〔Umberto Quattrocchi. 2000. ''CRC World Dictionary of Plant Names'' volume II:822. CRC Press: Boca Raton; New York; Washington, DC;, USA. London, UK. ISBN 978-0-8493-2676-9. (vol. 2). (see ''External links'' below).〕 The genus ''Distephanus'' was established by Alexandre de Cassini in 1817.〔Alexandre H.G. de Cassini. 1817. ''Bulletin des Sciences, par la Société Philomatique de Paris. (1817):151.〕 Cassini described the type species, ''Distephanus populifolia'' in 1819.〔Alexandre H.G. de Cassini. 1819. ''Dictionnaire des Sciences Naturelles, ··· Strasbourg. edition 2. (F. Cuvier).'' 19:361.〕 This species had originally been named ''Conyza populifolia'' by Jean-Baptiste Lamarck in 1786.〔Jean-Baptiste Lamarck. 1786. ''Encyclopedie Methodique. Botanique ··· Paris''. 2(1):87.〕 ''Distephanus'' has usually been placed in the tribe Vernonieae, but the results of some molecular phylogenetic studies of DNA sequences have cast doubt upon this placement. In one classification of Asteraceae, it was placed in a tritomy consisting of ''Distephanus'', Moquinieae, and Vernonieae.〔Vicki A. Funk, Alfonso Susanna, Tod F. Stuessy, and Randall J. Bayer. 2009. ''Systematics, Evolution and Biogeography of the Compositae''. IAPT (International Association for Plant Taxonomy). ISBN 978-3-9501754-3-1 (see ''External links'' below).〕 ''Distephanus'' differs from (other) genera in Vernonieae in having yellow flowers as well as in other characters that are less obvious.〔Harold E. Robinson. 1986. "Trinervate leaves, yellow flowers, tailed anthers, and pollen variation in ''Distephanus'' Cassini (Vernonieae: Asteraceae)". ''Proceedings of the Biological Society of Washington'' 99(3):493-501.〕 ==Species== Species include:〔(【引用サイトリンク】title=The Plant List: A Working List of All Plant Species )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Distephanus」の詳細全文を読む スポンサード リンク
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