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.
Dolan, Rebecca W. and LaPre, Lawrence F., "Taxonomy of Streptanthus sect. Biennes, the Streptanthus morrisonii complex" (1989). Scholarship and Professional Work - LAS. Paper 45.