Taxonomic Note:  Updated (Oct 2006) according to treatment in Flora North America.  In California, the genus Chrysothamnus has been previously recognized by the graduated phyllaries in vertical ranks, in contrast to the imbricated phyllaries that characterized the old genus, Haplopappus, which has been split up into many genera (Ericameria, Harzardia, Isocoma, etc.).  The old taxonomic treatment still seems practical even though it may not truly reflect the phylogeny of the group.

Chrysothamnus viscidiflorus ssp. viscidiflorus
Lassen NF., Eagle Lake, CA
Spjut 15551, Aug 2003

Ahmed A. A., M. E. Hegazy, N. M. Hassan, M. Wojcinska, J. Karchesy, P. W. Pare and T. J. Mabry. 2006. Constituents of Chrysothamnus viscidiflorus.  Phytochemistry 67(14):1547–1553. “A phytochemical investigation of the aerial parts of Chrysothamnus viscidiflorus var. viscidiflorus afforded three new [chrysothol (1), 2 and 4] and seven known compounds, including five sesquiterpenes, two cinnamic acid derivatives, two ketoalcohol derivatives and one coumarin glucoside. The structures of two previously reported compounds, 1b and 1c, were revised on the basis of chemical reaction. Structures of the compounds were determined by extensive NMR studies, including DEPT, COSY, NOE, HMQC, HMBC and X-ray analysis. The unpublished X-ray data of the known compounds 6 and 7 are reported. Compounds chrysothol (1), and 8-10 showed anti-cancer activity against human breast cancer cells.”