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Taxonomy of Streptanthus sect. Biennes, the Streptanthus morrisonii complex

Rebecca W. Dolan, Butler University
Lawrence F. LaPre, Butler University

Abstract

The Streptanthus morrisonii complex is a six-taxon group of closely related serpentine rock outcrop endemics from Lake, Napa, and Sonoma counties of California, USA. Two new subspecies (S. morrisonii subsp. kruckebergii and S. brachia/us subsp. hoffmanii) from Lake County, California, are described. The relationship of these taxa to others in the section is reviewed and descriptions and a key are provided.