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Cosmos caudatus asteraceae coreopsideae in mexico a cytotaxonomic reappraisal



Cosmos caudatus asteraceae coreopsideae in mexico a cytotaxonomic reappraisal



Phytologia 69(3): 200-215



Data from cytotaxonomic, comparative flavonoid and greenhouse progeny studies (morphology and reproductive biology) are combined to show that the Mexican populations of the pantropical annual, Cosmos caudatus H.B.K., includes two very distinct species: a relatively small headed, self compatible tetraploid (C. caudatus sensu Sherff) which in Mexico frequents the Gulf Coastal Plain from southern Tamaulipas, southward to Chiapas and the Yucatan Peninsula: and a self incompatible diploid, the heretofore undescribed C. pacificus sp. nov., large headed "forms" of which are found along the Pacific slopes of the Transvolcanic Belt in southwestern Mexico State, Michoacan and Jalisco. Additionally, a "small headed" diploid from Chiapas (one known population) that is superficially very similar to nearby C. caudatus populations, is shown to be a geographically isolated member of the C. pacificus complex. The small headed Chiapas diploid is formally described as C. pacificus var. chiapensis var. nov.

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Accession: 007165495

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