Cirsium texanum

From Botanical Knowledge
Jump to: navigation, search


Cirsium texanum ranges from the Chihuahuan Desert regions of trans-Pecos Texas and adjacent southeastern New Mexico across the plains of Texas and southern Oklahoma to southwestern Arkansas and southwestern Louisiana and south into north-central Mexico. D. S. Correll and M. C. Johnston (1970) suggested hybridization between Cirsium texanum and C. undulatum to explain anomalous specimens in the Edwards Plateau and trans-Pecos regions of western Texas.

Facts about "Cirsium texanum"
apex external texturescabrid-ciliolate +
apex prominence or shapeflat +
apex shapeacuminate +
array architecturepaniculiform +
base architectureauriculate-clasping +
base shapedecurrent +, distalmost +, lanceolate +, bractlike +, dentate + and lobed +
blade shapeoblong +, elliptic +, unlobed +, spinulose +, dentate + and pinnatifid +
body shapeentire + and acute +
branch orientationascending +
chromosome count22 +, 23 + and 24 +
collar variabilitydifferentiated +
corolla colorationwhite + and pink-purple +
cypsela colorationbrown +
face architecturewinged +, petiolate + and sessile +
face countabsent +
face external texturearachnoid tomentose +, glabrous + and arachnoid +
face orientationappressed +
face other or positionproximal +
face positionadaxial +, basal +, cauline +, mid +, distal +, outer + and middle +
face sizereduced +
flowering timespringsummer +, apr +, may +, jun + and jul +
habitatroadsides pastures fields + and shrub-tree savannas +
involucre external texturearachnoid + and glabrate +
involucre shapeovoid + and hemispheric +
leaf arrangementcrowded +
lobe arrangementseparated +
lobe shapetriangular +, dentate +, lobed +, obtuse + and acute +
peduncle sizeslender +
petiole life stageflowering +
petiole sizeslender +
phyllary arrangementimbricate +
phyllary colorationgreen +
phyllary shapelanceolate + and linear +
ridge prominenceprominent +
sinus widthnarrow + and wide +
spine fragilityto stout +
spine orientationspreading +
spine sizeslender +
stem countsingle +
stem external texturetomentose + and glabrate +
stem orientationerect +
throat widthwider +
whole organism architecturetaprooted +
whole organism life styleannual + and biennial +