Cirsium drummondii

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Cirsium drummondii is widely distributed across Canada from the Northwest Territories to British Columbia and Ontario. The name C. drummondii has been misapplied to a wide range of plants across the western United States that are now treated as one or another variety of the polymorphic C. scariosum. The only documented modern occurrences of C. drummondii in the United States are in the Black Hills of South Dakota and adjacent Wyoming. Specimens collected by Hall and Harbour (342) are the only ones of C. drummondii known from Colorado. Somewhat similar plants from northern Nevada are treated here as C. scariosum var. toiyabense. During Pleistocene glaciations the ancestors of C. drummondii undoubtedly occupied a more southerly distribution and very likely came into direct contact with populations of C. scariosum. The observed similarities between C. drummondii and C. scariosum var. toiyabense are probably a relict of that ancient contact.

Facts about "Cirsium drummondii"
apex architecture or shapespineless +
apex positioninner + and innermost +
apex shapenarrowed + and scabrid-denticulate +
array architecturecorymbiform +
blade shapeoblong-elliptic +, oblanceolate + and pinnatifid +
branch fragilitystout +
branch height or lengthshort +
branch orientationascending +
collar colorationyellow +
collar widthnarrow +
corolla colorationpurple + and white +
cypsela colorationstramineous + and brown +
face architectureprincipal + and sessile +
face arrangementcrowded +
face countpresent +
face external texturevillous + and arachnoid +
face orientationappressed +
face othersimilar + and proximal +
face positionadaxial +, basal +, distal +, outer + and mid +
face sizereduced +
flowering timesummerjun +, jul + and aug +
habitatdry to moist soil +, prairies +, pastures +, meadows +, forest edges +, woodland openings + and roadsides +
habitat moisturewet + and dry +
head arrangementsingly + and crowded +
involucre external texturearachnoid + and glabrate +
involucre shapeovoid +, hemispheric + and campanulate +
involucre widthwider +
lobe arrangementseparated +
lobe orientationspreading +
lobe shapeovate +, triangular +, spinose-dentate + and lobed +
peduncle architectureleafy-bracted +
phyllary arrangementimbricate +
phyllary shapeovate +, lanceolate + and lance-linear +
ridge widthnarrow +
sinus shapeu-shaped +
sinus widthbroad +
spine orientationerect + and ascending +
spine sizeslender +
stem architectureleafy +, simple + and branched +
stem external texturevillous + and tomentose +
stem fragilitystout +
stem internal texturefleshy +
stem orientationerect +
taproot fragilitystout +
tip courseflexuous +
tip shapeerose-denticulate +
tip sizeexpanded +
trichome architectureseptate +
trichome lengthlong +
whole organism architectureacaulescent + and caulescent +
whole organism life stylebiennial + and perennial +