Cirsium hookerianum

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Cirsium hookerianum occurs from the Canadian Coast Ranges of British Columbia east to the northern Cascade Range and the northern Rocky Mountains. The relationship between C. hookerianum, C. kelseyi, which I have tentatively included in C. hookerianum, and C. longistylum needs further investigation. A case could be made for including all three in an expanded concept of C. hookerianum, but more investigation of the variation patterns is needed before this is done. Certainly C. kelseyi is better treated within or as a close ally of C. hookerianum than in C. scariosum (var. scariosum), where R. J. Moore and C. Frankton (1974) synonymized it. Cirsium hookerianum is known to hybridize with C. undulatum.

Facts about "Cirsium hookerianum"
apex arrangement or shapelinear +
apex orientationspreading + and ascending +
apex relieferose +
apex shapeplane +
apex sizeexpanded +
array architecturespiciform +, racemiform +, subcapitate +, branched + and corymbiform +
base architecture or shapespiny +
base colorationnon-pigmented +
base orientationshort-appressed +
base positiondistal +
base shapeshort-decurrent +
base sizereduced + and subequal +
base widthnarrower than proximal +
blade shapelinear-oblong +, elliptic +, subentire +, dentate + and pinnatifid +
branch height or lengthshort +
branch orientationascending +
chromosome count34 +
collar variabilitydifferentiated +
corolla colorationwhite +, ochroleucous + and pink +
cypsela colorationbrown +
face architecturewinged-petiolate + and sessile +
face arrangementdistributed +
face colorationgreen +
face countpresent +
face external texturegray-or-white-tomentose +, villous +, tomentose +, glabrous +, glabrate + and arachnoid +
face otherprincipal +
face positionadaxial +, basal + and cauline +
face sizereduced +
flowering timesummerjun +, jul +, aug + and sep +
habitatmoist soil +, grasslands +, aspen parkland +, forest edges and openings + and subalpine alpine meadows +
habitat moisturewet +
head arrangementsingly + and crowded +
involucre colorationgreen + and purplish +
involucre external texturevillous +
involucre shapeovoid +
lobe shapelance-oblong +, triangular +, spinulose +, spiny-dentate + and lobed +
phyllary shapeentire +
ridge widthnarrow +
spine coursestraight +
spine sizeslender +
stem architecturesimple + and short-branched +
stem count1 + and several +
stem external texturevillous +, arachnoid + and glabrate +
stem orientationerect + and ascending +
trichome architecturejointed + and septate +
trichome external texturefelted + and arachnoid +
vein sizetaxonname-major +
whole organism architecturetaprooted +
whole organism life stylebiennial + and perennial +
whole organism reproductionmonocarpic + and polycarpic +