Cirsium quercetorum

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Cirsium quercetorum occurs in the north and south Coast ranges of California from Mendocino to San Luis Obispo counties. It overlaps in range and habitat with several other thistle species and has been reported to hybridize with C. andrewsii, C. douglasii, C. occidentale, C. remotifolium var. odontolepis, and C. fontinale var. fontinale (F. Petrak 1917; J. T. Howell 1960b). Considerable variation occurs within the range of C. quercetorum, and two of the variants have been given taxonomic recognition as vars. walkerianum and xerolepis. Additional study over the range of the species is needed to determine whether these or other variants should be recognized formally.

Facts about "Cirsium quercetorum"
apex positioninner +
apex shapenarrowed +, scabrido-denticulate +, with expanded , spinuloso-serrate-or-dentate tips +, spineless + and spine-tipped +
base othersimilar + and proximal +
base positiondistal +
base shapedecurrent +
base sizereduced +
blade shapeelliptic +, obovate +, undulate + and pinnatifid +
body colorationcolored +
branch count0 + and few +
branch orientationascending +
bud derivationadventitious +
chromosome count32 +
corolla colorationwhite +, lavender + and purple +
cypsela colorationbrown +
face architecturepetiolate +
face countpresent +
face durationpersistent +
face external texturetomentose +, villous +, glabrescent +, trichomes + and arachnoid-tomentose +
face otherprincipal +
face positionadaxial +, basal +, cauline + and outer +
face shapeentire +
face sizereduced +
flowering timespringsummer +, apr +, may +, jun +, jul + and aug +
habitatdry sites +, coastal bluffs +, grasslands +, oak woodlands + and coastal scrub +
habitat inclinesloped +
habitat moisturedry +
head arrangementcrowded +
head conditionlater +
head orientationerect +
involucre external texturearachnoid + and glabrate +
involucre shapeovoid +, hemispheric + and campanulate +
involucre sizesmaller +
lobe arrangementspaced +
lobe lengthlonger than 2 cm +
lobe orientationspreading +
lobe shapelinear-lanceolate +, triangular +, spinose-dentate + and lobed +
margin orientationappressed +
margin positionouter + and mid +
mound orientationerect +
mound shaperounded +
peduncle architectureleafy-bracted +
phyllary arrangementimbricate +
phyllary shapeovate +, lanceolate + and linear-lanceolate +
spine fragilityto stout +
spine orientationerect + and ascending +
spine sizeslender +
stem external textureglabrous +, gray-tomentose + and villous +
stem orientationerect + and ascending +
tip shapespinuloso-serrate-or-dentate +
tip sizeexpanded +
trichome architectureseptate +
whole organism architecturesubacaulescent +
whole organism architecture or arrangementcompact +
whole organism life styleperennial +
wing architecture or shapespiny +