Cirsium hookerianum

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.

apex arrangement or shape	linear +
apex orientation	spreading + and ascending +
apex relief	erose +
apex shape	plane +
apex size	expanded +
array architecture	spiciform +, racemiform +, subcapitate +, branched + and corymbiform +
base architecture or shape	spiny +
base coloration	non-pigmented +
base orientation	short-appressed +
base position	distal +
base shape	short-decurrent +
base size	reduced + and subequal +
base width	narrower than proximal +
blade shape	linear-oblong +, elliptic +, subentire +, dentate + and pinnatifid +
branch height or length	short +
branch orientation	ascending +
chromosome count	34 +
collar variability	differentiated +
corolla coloration	white +, ochroleucous + and pink +
cypsela coloration	brown +
face architecture	winged-petiolate + and sessile +
face arrangement	distributed +
face coloration	green +
face count	present +
face external texture	gray-or-white-tomentose +, villous +, tomentose +, glabrous +, glabrate + and arachnoid +
face other	principal +
face position	adaxial +, basal + and cauline +
face size	reduced +
flowering time	summerjun +, jul +, aug + and sep +
habitat	moist soil +, grasslands +, aspen parkland +, forest edges and openings + and subalpine alpine meadows +
habitat moisture	wet +
head arrangement	singly + and crowded +
involucre coloration	green + and purplish +
involucre external texture	villous +
involucre shape	ovoid +
lobe shape	lance-oblong +, triangular +, spinulose +, spiny-dentate + and lobed +
phyllary shape	entire +
ridge width	narrow +
spine course	straight +
spine size	slender +
stem architecture	simple + and short-branched +
stem count	1 + and several +
stem external texture	villous +, arachnoid + and glabrate +
stem orientation	erect + and ascending +
trichome architecture	jointed + and septate +
trichome external texture	felted + and arachnoid +
vein size	taxonname-major +
whole organism architecture	taprooted +
whole organism life style	biennial + and perennial +
whole organism reproduction	monocarpic + and polycarpic +

Cirsium hookerianum

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