Cirsium scariosum

Cirsium scariosum is a widely distributed complex of intergrading races distributed from southwestern Canada to northwestern Mexico. These plants range from acaulescent rosettes with a tight cluster of sessile heads to tall, erect, unbranched plants, or moundlike, more or less openly branched herbs. Acaulescent and caulescent plants sometimes occur in the same population.

apex position	inner +
apex shape	narrowed +, scabro-denticulate +, with expanded , erose-dentate tips +, spineless + and tipped +
array architecture	spiciform +, racemiform + and subcapitate +
blade arrangement or shape	linear + and to elliptic +
blade shape	plane +, undulate +, unlobed + and pinnatifid +
branch arrangement	crowded +
chromosome count	34 + and 36 +
collar coloration	colored +
corolla coloration	white +, lavender + and purple +
cypsela coloration	light + and brown +
face architecture	winged-petiolate + and distal +
face architecture or shape	bractlike +
face count	present + and many +
face development	developed +
face duration	persistent +
face external texture	glabrous +, tomentose +, villous +, glabrate +, trichomes +, arachnoid tomentose + and glabrescent +
face orientation	appressed +
face other	similar + and proximal +
face position	adaxial +, basal +, cauline +, distal +, outer + and mid +
face size	reduced +
face width	narrower +
form architecture	caulescent +
head arrangement	singly + and crowded +
head orientation	erect +
involucre external texture	arachnoid + and glabrate +
involucre shape	ovoid + and hemispheric +
lobe arrangement	spaced +
lobe orientation	spreading +
lobe shape	linear-lanceolate +, triangular +, spinose-dentate + and lobed +
margin shape	entire + and scarious-fringed +
mound position	low +
mound shape	rounded +
pappus coloration	white + and tan +
peduncle architecture	leafy-bracted +
phyllary arrangement	imbricate +
phyllary shape	ovate +, lanceolate +, linear + and linear-lanceolate +
spine fragility	to stout +
spine orientation	erect + and spreading +
spine shape	flattened +
spine size	slender +
stem architecture	simple +
stem count	absent +
stem external texture	glabrous +, gray-tomentose + and villous +
stem internal texture	fleshy +
stem orientation	erect +
stem width	thickened +
throat size	larger +
tip shape	erose-dentate +
tip size	expanded +
trichome architecture	septate +
whole organism architecture	acaulescent +, caulescent +, taprooted + and short-caulescent +
whole organism height or length	short +
whole organism life style	biennial +, perennial + and plant +
whole organism orientation	erect +

Cirsium scariosum

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