Cirsium arvense

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fna:Cirsium_arvense (Flora of North America)

Cirsium arvense is one of the most economically important agricultural weeds in the world. It was introduced to North America in the 1600s and soon was recognized as a problem weed. Weed control legislation against the species was passed by the Vermont legislature in 1795 (R. J. Moore 1975). Canada thistle is now listed as a noxious weed in most areas where it occurs. It has very high seed production, and the runner roots readily survive the fragmentation that accompanies cultivation.

Facts about "Cirsium arvense"
Imported from
"Imported from" is a predefined property that describes a relation to an imported vocabulary.
fna:Cirsium_arvense | fna import +
apex courseflexuous +
apex orientationascending + and spreading +
apex prominence or shapeflat +
array architecturecorymbiform + and paniculiform +
base architecturewinged-petiolate + and sessile +
base architecture or shapespinulose +
base arrangementdistributed +
base otherprincipal +
base positioncauline + and distal cauline +
base shapetapered +, decurrent +, bractlike +, entire +, toothed + and lobed +
base sizelarger + and reduced +
blade shapeoblong + and elliptic +
branch orientationascending +
bud derivationadventitious +
chromosome count34 +
collar variabilitydifferentiated +
corolla architecturestaminate +
corolla colorationpurple +, white + and pink +
corolla lengthlonger +
cypsela colorationbrown +
face colorationgreen +
face countabsent +
face external textureglabrous +, gray-tomentose + and tomentose +
face orientationappressed +
face positionadaxial +, basal +, outer + and middle +
face shapeentire +
flowering timesummerjun +, jul +, aug +, sep + and oct +
habitatdisturbed sites fields +, pastures + and roadsides forest openings +
head arrangementsingly + and in corymbiform or paniculiform arrays +
head life stagemature +
head structurepappus +
involucre external texturearachnoid tomentose + and glabrate +
involucre shapeovoid + and campanulate +
lobe architecturepistillate +
lobe arrangementseparated +
lobe shapelance-oblong +, triangular-ovate +, spinulose +, few-toothed + and few-lobed +
margin architecture or shapespinulose +
margin shapeplane +, revolute +, entire +, dentate + and pinnatifid +
petiole architecturewinged +
petiole life stageflowering +
phyllary arrangementimbricate +
phyllary colorationpurple-tinged +
phyllary shapeovate + and linear +
ridge widthnarrow +
root locationdeep-seated +
spine widthfine +
stem external textureglabrous + and appressed +
stem orientationerect +
throat size1 +
whole organism habitcolonial +
whole organism life styleperennial +
whole organism reproductiondioecious +