John C. Semple    WAT                          

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  Petradoria Nutt. 

ROCK GOLDENROD

A monotypic genus of small, herbaceous perennials native to western North America.  The genus has incorrectly been included in Solidago but differs in having a taprooted wood caudex and distinctive leaf anatomy.  Lane et al. (1996) showed that the on the bases of cpDNA, Petradoria was phylogenetically close to the true goldenrods with a number of other genera more closely related.   Zhang (1996) obtained the same results in his cpDNA RFLP study of the goldenrods.

•   Petradoria pumila; habit, Nevada

Last update 24 October 2005 by J.C. Semple            © 2005  J.C. Semple