Centaurea nigra

From Botanical Knowledge
Jump to: navigation, search


Black knapweed is listed as a noxious weed in Colorado and Washington.

Facts about "Centaurea nigra"
appendage arrangementoverlapping +
appendage colorationbrown + and black +
appendage orientationerect +
appendage prominence or shapeflat +
appendage sizeexpanded +
array architecturecorymbiform +
array architecture or shapefew-headed +
base prominenceconcealed +
blade shapeoblanceolate +, elliptic +, linear +, lanceolate +, entire + and dentate +
body external texturetomentose + and glabrous +
body shapelanceolate + and ovate +
bristle colorationblackish +
bristle countmany +
bristle habitdeciduous +
bristle sizeunequal +
chromosome count22 + and 44 +
corolla colorationpurple + and white +
cypsela colorationtan +
cypsela external texturehairy +
floret reproductionfertile +
flowering timesummerfall +, jun +, jul +, aug +, sep + and oct +
habitatroadsides +, fields +, clearings + and waste areas +
hair architectureseptate +
head architecture or shapediscoid +
involucre heighthigh +
involucre shapeovoid +, campanulate + and hemispheric +
involucre size15 +
leaf architecturepetiolate +
leaf other or positionproximal cauline +
leaf positionbasal +
lobe architecturewiry +
lobe countnumerous +
margin architecturesessile +
margin positiondistal cauline +
margin shapeentire +, dentate +, lobed +, decurrent + and dissected +
margin sizesmaller +
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 +