Centaurea virgata subs. squarrosa

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Squarrose knapweed is an invasive pest in rangelands of western North America. At maturity the fruiting heads readily fall from the plant and can become lodged in the fur of animals. Centaurea virgata subsp. squarrosa has been declared a noxious weed in several western states.

appendage orientationspreading +
appendage shapefringed + and tipped +
array architecturepaniculiform +
body colorationgreen +, stramineous + and purple-tinged +
body external textureglabrous + and tomentose +
body patternresin-gland-dotted +
body shapeovate + and lanceolate +
bristle colorationwhite +
chromosome count36 +
corolla arrangement or shapelinear +
corolla colorationpink + and purple +
corolla shape3-lobed +
cypsela colorationbrown + and stramineous +
cypsela external textureglabrous +
floret reproductionfertile +
floret sizeslender +
flowering timesummerjun +, jul +, aug + and sep +
habitatrangelands +, pastures +, open forests + and roadsides +
head architecturesessile + and short-pedunculate +
head architecture or shapedisciform +
involucre behaviourfalling +
involucre shapeovoid + and cylindric +
leaf architecturepetiolate +
leaf countabsent +
leaf external texturetomentose +
leaf other or positionproximal cauline +
leaf patternresin-gland-dotted +
leaf positionbasal +
margin architecturesessile + and simple +
margin external texturescarious +
margin positionmid + and distal cauline +
margin shapedivided +
margin sizesmaller +
pappus sizereduced +
phyllary shapelanceolate + and acute +
segment arrangement or shapelinear +
spine colorationstramineous +
spine orientationspreading + and reflexed +
spine sizeslender +
stem architecturemuch-branched +
stem countseveral +
stem external texturetomentose +
stem patternresin-gland-dotted +
whole organism external texture or reliefscabrous +
whole organism life styleperennial +