Cirsium grahamii

Cirsium grahamii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Cirsium
Species:	C. grahamii
Binomial name
	Cirsium grahamii; A.Gray
Synonyms
	Carduus grahamii (A.Gray) Greene; Cnicus grahamii A.Gray;

Cirsium grahamii, called Graham's thistle, is a North American species of plants in the thistle tribe within the sunflower family. The species is native to Sonora, Chihuahua, Durango, Nuevo León, New Mexico, and Arizona.^[2]^[3]^[4]

Cirsium grahamii is a biennial herb up to 100 cm (40 inches) tall, blooming only once before dying. Leaves have thin spines along the edges. There is several flower heads per plant, with deep purple disc florets but no ray florets.^[4]

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Photo of herbarium specimen collected in Nuevo León

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[1] The Plant List, Cirsium grahamii A.Gray

[2] Biota of North America Program 2014 county distribution map

[3] Tropicos, Cirsium grahamii A. Gray

[i-4] Graham’s thistle , Flora of North America, Cirsium grahamii A.Gray

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