GUTIERREZ Diego German
Systematics of Liabum Adans. (Asteraceae, Liabeae)
GUTIERREZ, D. G.; KATINAS, L.
Systematic Botany Monographs
the American Society of Plant Taxonomists
Lugar: Washington; Año: 2015 vol. 97 p. 1 - 121
Liabum Adans. is one of the most important genera of the tribe Liabeae in terms of number of species and widest overall distribution, contains 22 species distributed from southeastern Mexico to northwestern Argentina, and in Cuba, Jamaica, and Hispaniola. Its main center of species diversity is in Peru. Its species are perennial herbs, subshrubs, or shrubs, rarely scandent shrubs or small trees, without latex, with opposite, tripliveined leaves, radiate, heterogamous capitula, and yellow corollas. This revision includes two new species from Ecuador and Peru, Liabum dillonii and L. robinsonii, respectively. In addition, new synonyms are proposed and 151 names of taxa are excluded from Liabum. The morphology and anatomy of Liabum was studied, and descriptions, illustrations, and maps for each species, and the first key distinguishing all the species of Liabum are included. A principal component analysis of 100 plants representing the morphological variability and geographic distribution of the Caribbean species of Liabum were conducted to test the validity of these taxa resulting in a single, highly variable species, L. umbellatum.