Cirsium remotifolium

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Cirsium remotifolium occurs from the Coast Ranges and valleys of the Pacific Northwest to the western slopes of the Cascade and Klamath ranges, south in the California North Coast Ranges to the San Francisco Bay region. It is closely related to the C. clavatum complex of the Rocky Mountains region. Both have a similar growth habit and some forms variably express the character of broadly scarious, lacerate-toothed phyllary margins. Gray, in naming Cnicus carlinoides var. americanus, included as syntypes both California and Colorado specimens. F. Petrak (1917) treated both the West Coast plants and those of the Rocky Mountains as Cirsium subsect. Americana, recognizing C. remotifolium with several infraspecific taxa plus two other species, C. callilepis and C. amblylepis from the West Coast, and four additional species from the Rocky Mountains. A. Cronquist (1955) rejected Petrak’s subspecies, treating C. remotifolium in a restricted sense, limited to plants of Washington and Oregon without dilated phyllary tips, and circumscribed C. centaureae broadly to include the Rocky Mountains and West Coast plants with dilated phyllary tips. Because of the frequent presence of dilated phyllary tips in C. remotifolium in the restricted sense, Cronquist acknowledged the likelihood of past introgression with C. centaureae in the broad sense.

Facts about "Cirsium remotifolium"
apex external texturescarious +
apex orientationreflexed +
apex prominence or shapeflat +
apex shapeentire + and lacerate-dentate +
apex sizeexpanded +
apex widthnarrow +
array architecturecorymbiform +, racemiform + and paniculiform +
base architectureauriculate-clasping + and spinier +
base architecture or shapebractlike +
base arrangementseparated +
base orientationappressed +
base positiondistal + and outer +
base shapenarrowed +, auriculate +, unlobed + and divided +
base sizereduced + and expanded +
blade shapelinear-oblong +, oblanceolate +, elliptic +, unlobed +, spinulose +, dentate + and pinnatifid +
bract arrangement or habitclustered +
branch orientationarising + and ascending +
branch sizeslender +
chromosome count32 +
collar variabilitydifferentiated +
corolla colorationwhite + and purple +
cypsela colorationtan + and brown +
face architecturewinged-petiolate + and sessile +
face arrangementimbricate +
face colorationgreen + and gray +
face countpresent +
face external texturearachnoid-tomentose +, glabrate +, villous + and glabrous +
face otherprincipal +
face positionadaxial +, basal +, cauline + and inner +
head arrangementsingly + and in openly branched in corymbiform , racemiform , or paniculiform arrays +
involucre external textureglabrous + and arachnoid-floccose +
involucre shapeovoid +, hemispheric + and campanulate +
lobe arrangementseparated +
lobe shapelinear +, triangular-ovate +, dentate + and lobed +
margin external texturescarious +
margin shapeentire +, spinulose-dentate + and lacerate-dentate +
ridge prominenceinconspicuous +
spine countabsent + and ascending to spreading +
spine orientationascending + and spreading +
spine sizeslender +
stem count1 +
stem external texturearachnoid-tomentose + and villous +
stem orientationerect +
trichome architectureseptate +
whole organism architecturetaprooted +
whole organism durationperennating +
whole organism life styleperennial +
whole organism reproductionmonocarpic + and polycarpic +