Cirsium altissimum

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Plants of Cirsium altissimum ranging from southern Minnesota to Texas often have more deeply divided leaves than do populations in other portions of the species’ range. Some botanists (e.g., R. J. Moore and C. Frankton 1969; D. S. Correll and M. C. Johnston 1970) have treated those plants as C. iowense. Others (e.g., R. E. Brooks 1986; H. A. Gleason and A. Cronquist 1991; G. B. Ownbey and T. Morley 1991) have treated them as C. altissimum. Still others considered them to be derivatives of hybridization between C. altissimum and C. discolor (J. T. Kartesz and C. A. Meacham 1999) and treated them as C. ×iowense. Indeed the existence of these plants blurs the distinction between C. altissimum and C. discolor, and herbarium specimens are often difficult to assign.

Facts about "Cirsium altissimum"
apex orientationspreading +
apex relieferose +
apex shapeflattened +, entire +, dilated + and serrulate +
apex widthnarrow +
array architecturecorymbiform + and paniculiform +
base architectureclasping +
base arrangementdistributed +
base developmentdeveloped +
base otherprincipal +
base positioncauline + and distal cauline +
base shapetapered + and narrowed +
base sizereduced +
blade shapeoblanceolate +, elliptic + and ovate +
body orientationappressed +
bract architecture or shapespiny +
branch orientationascending +
chromosome count18 +
collar colorationstramineous +
corolla colorationpink +, purple + and white +
cypsela colorationtan + and brown +
enlargement architecture or shapetuberlike +
face colorationgreen +
face countabsent +
face external texturewhite-tomentose +, glabrate + and villous +
face positionbasal +, outer + and middle +
face shapeentire +
flowering timesummerfall +, jun +, jul +, aug +, sep + and oct +
habitatprairies +, woodlands + and disturbed sites in damp soil +
head prominenceelevated +
involucre external texturearachnoid +
involucre shapeovoid +, cylindric + and campanulate +
lobe shapetriangular +
margin prominence or shapeflat +
margin shapespiny-toothed +, undivided +, toothed + and pinnatifid +
peduncle architectureleafy-bracted +
phyllary arrangementimbricate +
phyllary colorationgreenish +
phyllary shapeovate + and lanceolate +
ridge colorationmilky + and dark +
ridge internal texturedry +
ridge widthnarrow +
root external texturecoarse +
root internal texturefibrous +
spine orientationspreading +
spine sizeslender +
stem countsingle +
stem external texturevillous +, glabrate + and tomentose +
stem orientationerect +
taproot arrangementcluster +
trichome architectureseptate +
whole organism life stylebiennial + and perennial +
zone colorationdarker +
zone positionsubapical +