Cirsium tracyi

From Botanical Knowledge
Jump to: navigation, search


Cirsium tracyi occurs from eastern Utah and western Colorado south in the Colorado Plateau and southern Rocky Mountains to northwestern New Mexico. Large-headed plants of Cirsium tracyi and small-headed individuals of C. undulatum are sometimes difficult to distinguish. P. L. Barlow-Irick (unpubl.) found that although there is much overlap in floral measurements of C. tracyi and C. undulatum, the means for some of these characters are statistically significant. Corolla lobes of C. tracyi, for instance, average about 7 mm and those of C. undulatum about 10 mm. The species differ in chromosome number as well.

Facts about "Cirsium tracyi"
array architectureleafy + and corymbiform +
base architectureauriculate-clasping +
blade shapeelliptic + and oblong +
branch countfew + and many +
branch orientationascending +
chromosome count24 +
collar colorationcolored + and yellowish +
collar widthnarrow +
corolla colorationwhite +, lavender + and pink-purple +
cypsela colorationlight + and brown +
division characterentire-margined +
division shapelanceolate +, triangular + and spine-tipped +
face architecturespinier +
face countpresent +
face external texturegray-tomentose + and tomentose +
face orientationappressed +
face otherprincipal +
face positionadaxial +, basal +, cauline +, distal cauline +, outer + and middle +
face shapeshort-decurrent +
face sizereduced +
flowering timespringsummer +, jun +, jul + and aug +
habitatdry slopes +, sagebrush deserts +, pinyon-juniper woodlands +, openings in montane coniferous forests + and in disturbed areas +
habitat inclinesloped +
habitat moisturedry +
head positionterminal +
involucre external texturearachnoid + and glabrate +
involucre shapeovoid +, hemispheric + and campanulate +
lobe architecture or shapespinulose +
lobe arrangementseparated +
lobe orientationascending + and spreading +
lobe shapetriangular +, dentate + and cleft +
margin shapeundulate +, spinose-dentate +, lobed + and entire +
pappus height or lengthshorter +
phyllary arrangementimbricate +
phyllary shapeovate +, lanceolate + and linear-lanceolate +
ridge prominenceprominent +
spine courseflexuous +
spine fragilitystout + and weak +
spine orientationspreading +
spine positioninner +
spine shapeflat +, entire +, spineless + and tipped +
spine sizeslender +
spine widthnarrow +
stem external texturegray-tomentose + and glabrate +
stem orientationerect + and ascending +
whole organism architecturetaprooted +
whole organism life styleperennial +