Funk, Vicki A. , Kelloff, Carol L. , Chan, Raymund .
Phylogeny and Biogeography of the Compositae tribe Liabeae.
The tribe Liabeae (Compositae) contains approximately 175 species distributed in 19 genera and its members occupy a variety of habitats throughout Mexico, Central America, the West Indies, and western South America. The greatest diversity in the tribe is found in Peru, where no fewer than 13 genera and over 70 species are recorded. The tribe is characterized by a combination of morphological characters, including opposite leaves, these often strongly trinervate, with white-tomentose pubescence beneath, yellow ray and disk florets, oblong or columnar achenes usually with a biseriate pappus of outer scales and inner scabrous bristles, and the frequent occurrence of white latex. Its acceptance as a distinct tribe was not immediate and its component taxa have been variously placed in several tribes, most frequently the Vernonieae or Senecioneae. Recent phylogenetic studies have supported the monophyly of the tribe and its placement near the Vernonieae. The results of this molecular investigation have recovered consistent placements for all taxa except Cacosmia (Clade A) which can be the sistergroup of the rest of the tribe or, of the clade containing Liabum. Four well-supported clades (B-E) are recovered in the remainder of the tribe: Clade B consists of Ferreyranthus, Dillandia, Oligactis, Sampera, and Liabum representing ~64 species, Clade C consists of the Sinclairia complex, including segregates, Liabellum, Megaliabum, and Sinclairiopsis representing ~26 species, Clade D consists of the Stephenbeckia, Microliabum, Pseudonoseris, Paranephelius, Chionopappus, Philoglossa and Erato representing ~27 species, and its sister group, Clade E, contains Chrysactinium nested in a paraphyletic Munnozia s.l. containing ~54 species. Bishopanthus, with only a scrap of material in existence, no chromosome counts, and no molecular data, could not be placed in one of the aforementioned groups; likewise, its morphology is not helpful because it appears similar to Cacosmia (Clade A) based on its leaves and to Chionopappus (Clade D) based on its capitular morphology.
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1 - US National Herbarium, Smithsonian Institution , Department of Botany MRC 166, National Museum of Natural History, Washington, DC, 20013-7012, USA
2 - Smithsonian Institution, Dept. of Botany, MRC166, NMNH, P.O. Box 37012, 10 & Constitution Ave, NW, Washington, DC, 20013, USA
3 - National Museum of Natural History, Smithsonian Institution, Department of Botany, MRC-166, P.O. Box 37012, Washington, DC, 20013-7012, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 556A/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 2:00 PM