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The identity of thalictrum confine ranunculaceae


Brittonia 40(3): 298-305
The identity of thalictrum confine ranunculaceae
A history of the collecting and naming of Thalictrum confine Fern. is detailed in an attempt to clear up long-standing nomenclatural and taxonomic confusions. Thalictrum confine has traditionally been distinguished from T. venulosum Trel. on the basis of its larger, falcate fruits; however, the lectotype of T. confine consists only of a packet of terete, subcylindric fruits, even smaller than those of the type specimen of T. venulosum. Fernald's original description of T. confine also does not match large-fruited plants which he later referred to that species. Those plants first cited by him as T. occidentale A. Gray, and later distributed as Gray Herbarium exsiccatae under the name T. confine, match specimens presently found at the type location of T. confine. Although fruit-growth was apparently arrested by frost-damage in the lectotype, it is perceived to represent the larger-fruited plants as well. Thalictrum confine is placed in synonym under polymorphic T. venulosum. Acceptance of infraspecific taxa in the group is discouraged, but, for those who wish to segregate larger-fruited trans-Canadian plants, the correct varietal name is T. venulosum var. confine (Fern.) B. Boivin, with T. turneri B. Boivin in synonymy.

Accession: 006689795

DOI: 10.2307/2807481

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