@ARTICLE{TreeBASE2Ref18300, author = {Wendy B. Zomlefer and William Mark Whitten and Norris H. Williams and Walter S. Judd}, title = {Infrageneric phylogeny of Schoenocaulon (Liliales: Melanthiaceae) with clarification of cryptic species based on ITS sequence data and geographical distribution}, year = {2006}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {American Journal of Botany}, volume = {93}, number = {}, pages = {1178--1192}, abstract = {As currently defined, the 24 species of Schoenocaulon occur in three disjunct areas: north central Florida (one species, S. dubium), southern Peru (portion of the range of S. officinale), and the region from southeastern New MexicoTexas south to Venezuela; the 20 species endemic to Mexico are geographically restricted. Species delimitations, often based on tepal morphology, have been problematic. Our analyses of ITS sequence data for all 27 species and infraspecific taxa support recognition of two new species and recircumscription and placement of elements of the polyphyletic S. ghiesbreghtii and S. mortonii complexes. For taxa with adequate sampling, our data also indicate 11 to 12 cladospecies and three to six metaspecies according to the apomorphic species concept. The resolved phylogeny, correlated with geography and morphology, allows insight into biogeographical diversification and the evolution of some unusual morphological characters within the genus, such as nectary differentiation and tepal margin type. Broader impacts: This study will be of interest to a wide variety of scientists, for example: those interested in the systematics of Liliales, in the flora of Mexico (and the southern United States), in speciation and the application of species concepts (especially in phylogenetic species approaches), and in phytogeographical patterns. The study also demonstrates the value of DNA sequences at the species level in clarifying species relationships.} }

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