Jin, Wenchi , Riina, Ricarda , Geltman, Dmitry , Berry, Paul E. .
Fruit evolution in Euphorbia subgenus Esula (Euphorbiaceae).
Euphorbia subgenus Esula is a predominantly temperate Eurasian plant group with over 470 species that forms the sister clade to three other major clades of Euphorbia (Euphorbiaceae). Most species of the subgenus are herbs with a thin capsule wall. Molecular phylogenetic analyses using nuclear ITS and chloroplast ndhF sequences support the monophyly of subgenus Esula, with Euphorbia lathyris, a species with a spongy capsule wall, as the sister species to all other taxa. According to the morphology of the capsule surface, species of Esula have two basic fruit types: smooth and warty. Our phylogeny indicates the monophyly of the warty-fruited taxa, with a smooth-capsuled species, E. helioscopia, as the sister species of this clade. The phylogeny also indicates an Old World origin for subgenus Esula. Most members of E. subgenus Esula are native to Eurasia, but there are about 37 native species in the New World. The New World taxa, however, do not form a monophyletic group. Comprehensive taxon sampling of E. subgenus Esula worldwide suggests that there were several independent colonizations from the Old World to the New World in the subgenus.
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1 - University of Michigan, Herbarium & Dept. Ecology and Evolutionary Biology, 3600 Varisty Drive, Ann Arbor, MI, 48108, USA
2 - Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov street, 2, St. Petersburg, 197376, Russia
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM