Cirsium rhothophilum

Cirsium rhothophilum is endemic to the dunes of southern San Luis Obispo and northern Santa Barbara counties. It rarely forms hybrids with C. occidentale var. occidentale and C. scariosum var. citrinum.

apex orientation	spreading + and erect +
apex relief	scabrid +
apex shape	serrate + and fringed +
array architecture	subcapitate +, congested + and corymbiform +
auricle size	expanded +
base architecture	clasping +
base orientation	short-appressed +
base position	distal + and outer +
base size	reduced +
blade shape	elliptic +, ovate +, undulate + and pinnatifid +
bract architecture	leafy +
bract arrangement or habit	clustered +
branch external texture	stiff +
branch orientation	inclined + and ascending +
caudex architecture	simple + and branched +
chromosome count	34 +
collar coloration	whitish +
corolla coloration	white + and yellow +
cypsela coloration	light-brown + and black +
face architecture	winged-petiolate + and sessile +
face arrangement	distributed +
face condition	withered +
face count	present +
face external texture	gray-white-tomentose +
face other	principal +
face position	basal + and cauline +
face size	reduced +
flowering time	springsummer +, apr +, may +, jun +, jul +, aug +, year round +, summer +, spring +, winter +, fall +, nov +, dec +, jan +, oct +, feb +, sep + and mar +
habitat	coastal dunes and bluffs +
habitat incline	sloped +
head orientation	erect +
head position	terminal +
involucre external texture	arachnoid +
involucre shape	hemispheric + and campanulate +
lobe shape	entire + and few-toothed-or-lobed +
margin architecture or shape	spiny-ciliate +
mound position	low +
mound shape	rounded +
phyllary arrangement	imbricate +
phyllary arrangement or shape	linear +
spine course	straight +
spine shape	abrupt +
stem external texture	gray-tomentose +
stem habit	bushlike + and forming low rounded mounds +
stem orientation	spreading + and erect +
trichome architecture	non-septate +
trichome external texture	feltlike +
trichome orientation	appressed +
whole organism architecture	taprooted +
whole organism life style	biennial + and perennial +

Cirsium rhothophilum

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