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Isocarpha oppositifolia : ウィキペディア英語版 | Isocarpha oppositifolia
''Isocarpha oppositifolia'', the Rio Grande pearlhead, is a New World species of plants in the sunflower family. It is widely distributed in eastern and southern Mexico, Central America, the West Indies (Cuba, Jamaica, Bahamas, Caymans, Trinidad), and northern South America (Colombia, Venezuela). The range extends northward, just barely crossing to the north side of the Río Grande in the two southernmost counties in Texas (Cameron + Hidalgo).〔(Biota of North America Program 2014 county distribution map )〕〔(David J. Keil & Tod F. Stuessy. 1981. Systematics of ''Isocarpha'' (Compositae: Eupatorieae). Systematic Botany (1981) 6(3): pp. 258-287 ) descriptions, line drawings, distribution maps for all 5 species〕 ''Isocarpha oppositifolia'' is an herb or subshrub up to tall. Leaves are up to long, usually narrow but sometimes egg-shaped. One plant produces several flower heads, each a long flower stalk, each head with 60-150 disc flowers but no ray flowers.〔 == References == 〔
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