View source for Cirsium hookerianum

{{Plant2000
|apex arrangement or shape=linear
|apex orientation=spreading;ascending
|apex relief=erose
|apex shape=plane
|apex size=expanded
|array architecture=spiciform;racemiform;subcapitate;branched;corymbiform
|base architecture or shape=spiny
|base coloration=non-pigmented
|base orientation=short-appressed
|base position=distal
|base shape=short-decurrent
|base size=reduced;subequal
|base width=narrower than proximal
|blade shape=linear-oblong;elliptic;subentire;dentate;pinnatifid
|branch height or length=short
|branch orientation=ascending
|chromosome count=34
|collar variability=differentiated
|corolla coloration=white;ochroleucous;pink
|cypsela coloration=brown
|face architecture=winged-petiolate;sessile
|face arrangement=distributed
|face coloration=green
|face count=present
|face external texture=gray-or-white-tomentose;villous;tomentose;glabrous;glabrate;glabrous;arachnoid;villous;tomentose
|face other=principal
|face position=adaxial;basal;cauline
|face size=reduced
|head arrangement=singly;crowded
|involucre coloration=green;purplish
|involucre external texture=villous
|involucre shape=ovoid
|lobe shape=lance-oblong;triangular;spinulose;spiny-dentate;lobed
|phyllary shape=entire
|ridge width=narrow
|spine course=straight
|spine size=slender
|stem architecture=simple;short-branched
|stem count=1;several
|stem external texture=villous;arachnoid;glabrate
|stem orientation=erect;ascending
|trichome architecture=jointed;septate;septate;septate
|trichome external texture=felted;arachnoid
|vein size=taxonname-major
|whole organism architecture=taprooted
|whole organism life style=biennial;perennial
|whole organism reproduction=monocarpic;polycarpic
|flowering time=summerjun;jul;aug;sep;
|habitat=moist soil;grasslands;aspen parkland;forest edges and openings;subalpine alpine meadows
|habitat moisture=wet
}}
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	jul +, aug +, sep + and summerjun +
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 +