Home/Species/ Gray Thistle

Cirsium griseum

(Rydb.) K. Schum.

Gray Thistle

GNRUnranked Found in 1 roadless area NatureServe Explorer →

GNRUnrankedGlobal Rank

Identity

Unique IDELEMENT_GLOBAL.2.1287832

Element CodePDAST2E420

Record TypeSPECIES

ClassificationSpecies

Classification StatusProvisional

Name CategoryVascular Plant

Endemicendemic to a single state or province

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderAsterales

FamilyAsteraceae

GenusCirsium

Concept Reference

Ackerfield, J.R., D.J. Keil, W.C. Hodgson, M.P. Simmons, S.D. Fehlberg, and V.A. Funk. 2020. Thistle be a mess: Untangling the taxonomy of Cirsium (Cardueae: Compositae) in North America. Journal of Systematics and Evolution 58(6): 881-912.

Taxonomic Comments

Ackerfield et al. (2020) recognize Cirsium griseum described by Rydberg (as Carduus griseus), but include C. modestum and C. oreophilum as conspecific and propose that var. osterhoutii (recognized as C. clavatum var. osterhoutii by Keil's FNA (2006) treatment) be recognized as a variety of C. griseum.

Keil's FNA (2006) treatment does not address C. oreophilum, but includes C. griseum, C. modestum, and C. scapanolepis in C. clavatum var. americanum. Kartesz (1999) includes C. griseum in C. scapanolepis, C. oreophilum in C. scariosum, and accepts C. modestum as distinct. Kartesz (1994) accepts C. griseum, C. modestum, and C. oreophilum as distinct species.

Ecology & Habitat

Other Nations (1)

United StatesNNR

Province	Rank	Native
Colorado	S4	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (1)

Colorado (1)

Area	Forest	Acres
Pagoda Peak	Routt NF	57,676

References (4)

Ackerfield, J.R., D.J. Keil, W.C. Hodgson, M.P. Simmons, S.D. Fehlberg, and V.A. Funk. 2020. Thistle be a mess: Untangling the taxonomy of <i>Cirsium </i>(Cardueae: Compositae) in North America. Journal of Systematics and Evolution 58(6): 881-912.
Flora of North America Editorial Committee (FNA). 2006a. Flora of North America north of Mexico. Vol. 19. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York. xxiv + 579 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.