Cirsium rhothophilum

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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.

Facts about "Cirsium rhothophilum"
apex orientationspreading + and erect +
apex reliefscabrid +
apex shapeserrate + and fringed +
array architecturesubcapitate +, congested + and corymbiform +
auricle sizeexpanded +
base architectureclasping +
base orientationshort-appressed +
base positiondistal + and outer +
base sizereduced +
blade shapeelliptic +, ovate +, undulate + and pinnatifid +
bract architectureleafy +
bract arrangement or habitclustered +
branch external texturestiff +
branch orientationinclined + and ascending +
caudex architecturesimple + and branched +
chromosome count34 +
collar colorationwhitish +
corolla colorationwhite + and yellow +
cypsela colorationlight-brown + and black +
face architecturewinged-petiolate + and sessile +
face arrangementdistributed +
face conditionwithered +
face countpresent +
face external texturegray-white-tomentose +
face otherprincipal +
face positionbasal + and cauline +
face sizereduced +
flowering timespringsummer +, apr +, may +, jun +, jul +, aug +, year round +, summer +, spring +, winter +, fall +, nov +, dec +, jan +, oct +, feb +, sep + and mar +
habitatcoastal dunes and bluffs +
habitat inclinesloped +
head orientationerect +
head positionterminal +
involucre external texturearachnoid +
involucre shapehemispheric + and campanulate +
lobe shapeentire + and few-toothed-or-lobed +
margin architecture or shapespiny-ciliate +
mound positionlow +
mound shaperounded +
phyllary arrangementimbricate +
phyllary arrangement or shapelinear +
spine coursestraight +
spine shapeabrupt +
stem external texturegray-tomentose +
stem habitbushlike + and forming low rounded mounds +
stem orientationspreading + and erect +
trichome architecturenon-septate +
trichome external texturefeltlike +
trichome orientationappressed +
whole organism architecturetaprooted +
whole organism life stylebiennial + and perennial +