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Cirsium rothrockii
Cirsium rothrockii (A. Gray) Petr.
Rothrock's Thistle
Asteraceae (Aster Family)
Synonym(s): Cirsium diffusum, Cirsium pulchellum ssp. diffusum
USDA Symbol: CIRO
USDA Native Status: L48 (N)
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Plant Characteristics
Duration: BiennialHabit: Herb
Size Notes: Up to about 5 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom Information
Bloom Color: RedBloom Time: Jun , Jul , Aug , Sep , Oct
Bloom Notes: No ray florets present, only disc florets.
Distribution
USA: AZ , UTWeb Reference
Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.Additional resources
USDA: Find Cirsium rothrockii in USDA PlantsFNA: Find Cirsium rothrockii in the Flora of North America (if available)
Google: Search Google for Cirsium rothrockii
Metadata
Record Modified: 2018-12-11Research By: CBR