FARMER, SUSAN B* and EDWARD E. SCHILLING. Department of Botany, 437 Hesler Biology Building, University of Tennessee, Knoxville TN 37996-1100. - Additional insights into Trilliaceae phylogeny: the Delostylis group.
An analysis was made of the evolutionary relationships of the
"Delostylis Group" of Trillium. Although this
Rafinesquian genus was never accepted, the name can be used to define
a group consisting of Trillium catesbaei, T. nivale,
T. persistens, and T. pusillum; the defining feature of
this group is the style which is basally fused. Recent phylogenetic
analyses of Trilliaceae have suggested that, based on morphology, it
may represent a distinct group, either within Trillium or as a
sister group to it. A comprehensive analysis of the "Delostylis
Group" as part of phylogenetic studies of Trilliaceae has not
been possible previously because molecular data were available for
only one of its species, T. pusillum. The status and
relationships of the "Delostylis Group" of Trillium
were evaluated based on comparisons of morphological and molecular
phylogenetic data (ITS and matK) for several varieties of T.
pusillum as well as for the other species in this group.
Key words: Delostylis, DNA sequence data, morphological data, phylogenetic analysis, Trilliaceae, Trillium