Cirsium foliosum

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Cirsium foliosum occurs in the northern Rockies from Wyoming to the Yukon and eastward to the Slave River area in the Northwest Territories and northeastern Alberta. Reports for Alaska are unconfirmed (R. Lipkin, Alaska Natural Heritage Program, pers. comm.). The name Cirsium foliosum has been misapplied to a wide range of plants across the western United States that now are treated as one or another variety of the polymorphic C. scariosum. The only documented occurrences of C. foliosum in the lower 48 states are in the mountains of northern Wyoming. Somewhat similar plants from other mountain areas of the western United States are treated as C. scariosum var. scariosum. During Pleistocene glaciations the ancestors of C. foliosum undoubtedly occupied a more southerly distribution and very likely came into direct contact with ancestral populations of C. scariosum. The observed similarities between C. foliosum and C. scariosum var. scariosum may be a relic of hybridization in that ancient contact zone. On the other hand, the corolla features of C. foliosum suggest that this is a self-pollinating species, perhaps derived from an ancestral population similar to the modern C. scariosum var. scariosum.

Facts about "Cirsium foliosum"
apex coursestraight +
apex orientationappressed + and ascending +
array architectureleafy-bracted + and subcapitate +
array densitydense +
array external texturewoolly +
base orientationappressed +
blade arrangement or shapeelliptic +
blade shapelinear-oblong +, oblanceolate +, subentire +, dentate + and pinnatifid +
bract architectureleafy +
bract arrangementcrowded +
chromosome count34 +
collar colorationyellow +
collar widthnarrow +
corolla colorationwhite + and pink +
cypsela colorationbrown +
face architecturewinged-petiolate + and sessile +
face arrangementdistributed +
face colorationgreen +
face countpresent +
face external texturegray-or-white-tomentose +, villous +, glabrous + and arachnoid +
face otherprincipal +
face positionadaxial +, basal +, cauline +, distal + and outer +
face shapeentire +
face sizereduced +
face widthnarrower than proximal +
flowering timesummerjul + and aug +
habitatmoist soil +, grasslands +, meadows + and edges and openings in boreal forest , subalpine forests and alpine slopes +
habitat moisturewet +
head architecturesessile + and subsessile +
head arrangementcrowded +
head orientationerect +
involucre colorationgreen +
involucre external textureglabrous + and villous +
involucre shapeovoid +
lobe shapelance-oblong +, triangular +, spinulose +, spiny-dentate + and lobed +
phyllary arrangementimbricate +
phyllary shapelanceolate +, ovate + and linear-lanceolate +
spine coursestraight +
spine sizeslender +
stem architecturesimple + and leafy +
stem count1 +
stem external texturevillous + and tomentose +
stem fragilitystout +
stem internal texturefleshy +
stem orientationerect +
throat sizeslender + and larger +
tip height or lengthshort +
tip positionexserted +
trichome architectureseptate +
trichome external texturefelted + and arachnoid +
vein sizetaxonname-major +
whole organism architecturetaprooted +
whole organism life stylebiennial + and perennial +