Cirsium arizonicum

From Botanical Knowledge
Jump to: navigation, search


The Cirsium arizonicum complex is widely distributed from the Sierra Nevada, White Mountains, and New York Mountains of eastern California across the mountains of the southern Great Basin and Colorado Plateau to the mountains of eastern Colorado, Arizona, and New Mexico. This group of plants comprises a series of intergrading races with intricately overlapping patterns of variation. For plants that I am treating as C. arizonicum (in the broad sense), F. Petrak (1917) recognized three species, one with a variety and two subspecies plus his unstated type subspecies and variety. R. J. Moore and C. Frankton (1974b) revised the complex, recognizing six species, three of them newly described, for the plants I treat as C. arizonicum plus C. turneri, which I do not include in C. arizonicum. P. L. Barlow-Irick (2002), in a work focused on statistical analyses of variation patterns, recognized six species also, but circumscribed very differently from those of Moore and Frankton. Two of the species proposed by Barlow-Irick have not been formally described.

Facts about "Cirsium arizonicum"
apex external textureciliolate +
apex height or lengthshort +
apex lengthinconspicuous +
apex orientationspreading + and ascending +
apex prominence or shapeflat +
apex shapeentire +
apex widthnarrow +
array architecturecorymbiform + and paniculiform +
base architectureclasping +
base architecture or shapebractlike +
base positiondistalmost +
base shapedecurrent +
blade arrangement or shapeoblong-elliptic +
blade shapeunlobed +, spinulose +, lobed + and divided +
body height or lengthshort +
body orientationappressed +
body positionouter +
body shapeentire +
branch orientationascending +
caudex architecturetaprooted +
chromosome count30 +, 32 + and 34 +
collar colorationstramineous +
corolla colorationpink +, red +, lavender +, purple + and white +
cypsela colorationbrown +
face architecturesessile +
face arrangementdistributed +
face colorationgreen +
face countpresent +
face external textureglabrous +, gray +, villous +, gray-tomentose + and glabrate +
face otherprincipal +
face positionadaxial +, basal + and cauline +
face sizediminished +
head orientationerect +
involucre external texturearachnoid + and glabrous +
involucre shapecylindric +, ovoid + and campanulate +
lobe shapeovate +, linear-acuminate +, lobed + and divided +
phyllary arrangementimbricate +
phyllary colorationgreen +, inner reddish to rich reddish-c-purple +, inner + and rich +
phyllary shapeovate +, lanceolate + and linear +
ridge prominenceinconspicuous +
ridge widthnarrow +
spine architectureunarmed +
spine coursestraight + and flexuous +
spine fragilitystout +
spine orientationerect +, reflexed + and ascending +
spine positioninner +
spine shapecylindric + and flattened +
spine sizeslender +
stem external textureglabrous +, arachnoid-tomentose + and glabrate +
stem orientationerect + and ascending +
trichome architecturenon-septate + and septate +
trichome external texturevillous +
trichome widthfine +
whole organism life styleperennial +
wing architecture or shapespiny +