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Systematics Section / ASPT

Farmer, Susan B. [1], Schilling, Edward [1].

Additional insights into Trilliaceae systematics: the Trillium pusillum complex and the "Delostylis Group".

A study of the Trillium pusillum complex as part of a study of the "Delostylis Group" of Trillium is nearing completion. The name Delostylis, although never accepted, 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. The status and relationships of the "Delostylis Group" of Trillium were evaluated based on molecular phylogenetic data (ITS, matK and a number of non-coding plastid regions) as well as morphological data for the varieties of T. pusillum as well as for the other species in this group. In addition,their relationships to the other non-Erectum pedicellate trilliums (e.g., T. ovatum and T. grandiflorum) were examined. Preliminary results suggest that the varieties of the T. pusillum complex are separable using molecular data; T. nivale is more closely related to T. grandiflorum than to the rest of the Delostylis Group; and T. ovatum var. hibbersonii is distinct from T. ovatum. Based on preliminary evidence, Delostylis is not monophyletic.


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Trillium and the Trilliaceae


1 - University of Tennessee, Department of Ecology and Evolutionary Biology, 437 Hesler Biology Building, 1406 Circle Drive, Knoxville, Tennessee, 37996-1100, USA

Keywords:
Trilliaceae
molecular phylogenetics
systematics
Trillium.

Presentation Type: Oral Paper
Session: 3-3
Location: Salon J - Austin Grand Ballroom/Hilton
Date: Monday, August 15th, 2005
Time: 8:45 AM
Abstract ID:419


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