Cirsium clavatum

Cirsium clavatum, the Fish Lake thistle or fringed thistle,^[2] is a North American species of plants in the tribe Cardueae within the family Asteraceae. The species is native to the western United States, the States of Wyoming, Colorado, Utah, Arizona, and New Mexico.^[3][4]

Cirsium clavatum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Cirsium
Species:	C. clavatum
Binomial name
Cirsium clavatum (M.E.Jones) Petr.
Synonyms[1]
Synonymy Carduus clavatus (M.E.Jones) A.Heller Cnicus clavatus M.E.Jones Carduus centaureae Rydb. Carduus laterifolius Osterh., syn of var. americanum Carduus spathulatus Osterh., syn of var. americanum Cirsium centaureae (Rydb.) K.Schum., syn of var. americanum Cirsium griseum (Rydb.) K.Schum., syn of var. americanum Cirsium laterifolium (Osterh.) Petr., syn of var. americanum Cirsium modestum (Osterh.) Cockerell, syn of var. americanum Cirsium scapanolepis Petr., syn of var. americanum Cirsium spathulifolium Rydb., syn of var. americanum Cnicus americanus (A.Gray) A.Gray, syn of var. americanum Carduus araneosus Osterh., syn of var. osterhoutii Carduus osterhoutii Rydb., syn of var. osterhoutii Cirsium araneans Rydb., syn of var. osterhoutii Cirsium osterhoutii (Rydb.) Petr., syn of var. osterhoutii

Cirsium clavatum is a biennial or perennial herb up to 100 cm (40 inches) tall, blooming only once before dying. Leaves have thin spines along the edge, much smaller than those of related species. There are several to many flower heads, with white or pale pink disc florets but no ray florets.^[5]

Varieties^[1][5]

• Cirsium clavatum var. americanum (A.Gray) D.J.Keil - Colorado, Utah, Wyoming
• Cirsium clavatum var. clavatum - Colorado, Utah
• Cirsium clavatum var. osterhoutii (Rydb.) D.J.Keil - Colorado