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Rothrock's Thistle

Cirsium arizonicum var. rothrockii (A. Gray) D. J. Keil

life cycle habit

USDA Plants data
biennial
URI: http://purl.obolibrary.org/obo/FLOPO_0980072

Definition: Of life span, a plant which lives for more than one but less than two years after germination, c.f. annual, ephemeral, perennial, of flowering with respect to architecture, hapaxanthic, monocarpic, pleonanthic.

Attribution: Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 12, July 2012. Glossary: http://www.mobot.org/mobot/research/apweb/top/glossarya_h.html#biennial

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