1. Systematics of the South American Hypochaeris sessiliflora Complex (Asteraceae, Cichorieae)1
- Author
-
Estrella Urtubey, Karin Tremetsberger, and Tod F. Stuessy
- Subjects
Systematics ,Hypochaeris sessiliflora ,biology ,Plant Science ,Asteraceae ,biology.organism_classification ,Trichome ,food.food ,Rosette (botany) ,Hypochaeris ,food ,South american ,Botany ,Cichorieae ,Ecology, Evolution, Behavior and Systematics - Abstract
The Hypochaeris sessiliflora complex (Asteraceae, Cichorieae) consists of nine species of the genus from South America (all in section Achyrophorus Scop.) that have sessile or nearly sessile flowering heads surrounded by a rosette of leaves. They occur at 1430–5100 m in elevation along the Andean chain from Venezuela to Chile and Argentina. Two species, H. sessiliflora Kunth and H. meyeniana (Walp.) Benth. & Hook. f. ex Griseb., are extremely polymorphic, and they vary conspicuously in the shape of the external phyllaries and presence or absence of different types of trichomes. They have the widest distributions (Venezuela to central Peru, and Peru to northern Chile and northwestern Argentina, respectively), they flower throughout the year, and they also are primarily associated with dry and sunny habitats. Hypochaeris meyeniana is characterized by retrorsely pinnatifid leaves (rarely lobate) and slightly narrower cypselar apices. Hypochaeris hohenackeri (Sch. Bip.) Domke and H. taraxacoides Ball...
- Published
- 2009