A taxonomic revision of Dicoma (Asteraceae : Cichorioideae : Mutisieae) for the Horn of Africa

A revision of the genus Dicoma (Asteraceae: Cichorioideae: Mutisieae) in th e Horn of Africa (Djibouti, Eritrea, Ethiopia, and Somalia) is provided. Th is area is probably a major center of radiation for this genus, and nine of the twelve species present are endemic here. The revision is based on both held observations and micro- and macromorphological study of herbarium spe cimens. Six of the twelve species recognized have been described recently b y the first two authors. For each species, data are presented on morphologi cal characteristics, area of distribution (of particular interest in view o f the incorrect information previously published for several of the species ), ecology, and local names. One new species, D. thuliniana, is described a nd illustrated, one new combination, D. schimperi subsp, cinerea, is propos ed, and D. lanuginosa is lectotypified.