Centaurea nigrescens

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Tyrol knapweed is considered to be a noxious weed in Washington and Oregon.

Facts about "Centaurea nigrescens"
appendage widthnarrow +
array architecturecorymbiform +
array architecture or shapefew-headed +
blade shapeoblanceolate +, elliptic +, linear +, lanceolate +, entire + and dentate +
blade sizesmaller +
body arrangementoverlapping +
body colorationbrown + and black +
body external texturetomentose + and glabrous +
body orientationerect +
body prominence or shapeflat +
body shapelanceolate + and ovate +
bristle countmany +
bristle durationcaducous +
bristle sizeunequal +
chromosome count22 + and 44 +
corolla colorationpurple + and white +
cypsela colorationtan +
cypsela external texturehairy +
floret reproductionfertile + and peripheral +
floret sizeexpanded +
flowering timesummerfall +, jun +, jul +, aug +, sep + and oct +
habitatroadsides +, fields + and waste areas +
hair architectureseptate +
head architectureradiant + and discoid +
involucre lengthlonger than wide +
involucre shapesubcylindric +, ovoid + and campanulate +
involucre size15 +
leaf architecturepetiolate +
leaf other or positionproximal cauline +
leaf positionbasal +
lobe architecturewiry +
margin architecturesessile +
margin positiondistal cauline +
margin shapeentire +, dentate +, lobed +, decurrent + and dissected +
pappus count0 + and of many unequal , sometimes caducous bristles +
peduncle architectureleafy-bracted +
stem architecturebranched +
stem external texturevillous +, scabrous +, tomentose + and glabrate +
stem orientationerect + and ascending +
tip shapetruncate +, dentate + and lobed +
whole organism life styleperennial +