Rock Garden Plants
Cirsium scariosum var. americanum (A.Gray) D.J.Keil trib. Cardueae 
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FamilyASTERACEAE
Genus speciesCirsium scariosum var. americanum (A.Gray) D.J.Keil trib. Cardueae
SynonymsCarduus longissimus A.Heller
 Cirsium tioganum (Congdon) Petr.
 Cnicus tioganus Congdon
Habitatgrassland and thickets
Altitude1000-2000m
Descriptionacaulescent, leaves oblanceolate, to 3cm, lower leaves mostly lobate with marginal spines, upper leaves subentire, capitula 3-9, in compact, terminal head
Size10-15cm
Colorpink, white
Bloomsummer
Ca
Typerosette
Cultivationmesic, slightly humous, semi-shady site
alpine house, moist, rich, drained soil, semi-shade
Propagationseed in spring, germ. 1 month, 13-18°C
root cuttings in late winter
Territory Northern America
     Northwestern U.S.A. (Colorado , Idaho , Oregon , Wyoming )
     Southwestern U.S.A. (California , Nevada , Utah )
     Mexico (Mexico Northwest)
BibliographyPlants of the World online powo.science.kew.org
International Plant Names Index www.ipni.org
Comments

ASTERACEAE

Cirsium scariosum americanum (A.Gray) D.J.Keil, Sida 21(1): 215 (2004)

Basionym:
Cirsium acaule americanum A.Gray, Proc. Acad. Nat. Sci. Philadelphia 15: 68 (1864)

Synonyms:
Carduus americanus (A.Gray) Greene
Cirsium americanum (A.Gray) Daniels
Cnicus americanus (A.Gray) A.Gray

Carduus acaulescens (A.Gray) Rydb.
Carduus longissimus A.Heller
Carduus tioganus (Congdon) A.Heller
Cirsium acaulescens (A.Gray) Daniels
Cirsium coloradoense acaulescens (A.Gray) Petr.
Cirsium coloradoense longissimum (A.Heller) Petr.
Cirsium drummondii acaulescens (A.Gay) J.F.Macbr.
Cirsium drummondii lanatum Petr.
Cirsium drummondii oregonense Petr.
Cirsium drummondii vexans Petr.
Cirisum tioganum (Congdon) Petr.
Cnicus drummondii acaulescens A.Gray
Cnicus tioganus Congdon

w. USA, nw. Mexico
73 COL IDA ORE WYO 76 CAL NEV UTA 79 MXN

1000-2000m

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