, Volume 23, Issue 4, pp 361–393 | Cite as

Taxonomy and distribution of Clematis, sect. Atragene (Ranunculaceae), in North America

  • James S. Pringle


Two North American species ofClematis, sect.Atragene (L.) DC, are recognized.C. occidentalis (Hörnern.) DC. is divided into three varieties, native respectively to eastern North America, the Rocky Mountains, and the Cascade Mountains of Washington.C. columbiana (Nutt.) Torr. & Gray is divided into two extensively intergrading varieties, one prevailing in the southern Rocky Mountains, the other in the northern foothills and in outlying mountain ranges. After a study of the type specimen ofC. columbiana, it was concluded that this name should be applied to the species hitherto commonly known asC. pseudoalpina (O. Kuntze) A. Nels., rather than to the taxon with which it has usually been associated. The two species are evidently closely related and appear occasionally to have hybridized in nature.


Type Specimen Rocky Mountain North American Species Current Season Cascade Mountain 
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Copyright information

© The New York Botanical Garden 1971

Authors and Affiliations

  • James S. Pringle
    • 1
  1. 1.Royal Botanical GardensHamiltonCanada

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