View source for Cirsium arvense

[[Imported from::fna:Cirsium_arvense]]
{{Plant2000
|apex course=flexuous
|apex orientation=ascending;spreading
|apex prominence or shape=flat
|array architecture=corymbiform;paniculiform
|base architecture=winged-petiolate;sessile
|base architecture or shape=spinulose;spinulose
|base arrangement=distributed
|base other=principal
|base position=cauline;distal cauline
|base shape=tapered;decurrent;bractlike;entire;toothed;lobed
|base size=larger;reduced
|blade shape=oblong;elliptic
|branch orientation=ascending
|bud derivation=adventitious
|chromosome count=34
|collar variability=differentiated
|corolla architecture=staminate
|corolla coloration=purple;white;pink
|corolla length=longer
|cypsela coloration=brown
|face coloration=green
|face count=absent
|face external texture=glabrous;gray-tomentose;glabrous;tomentose
|face orientation=appressed
|face position=adaxial;basal;outer;middle
|face shape=entire
|head arrangement=singly;in corymbiform or paniculiform arrays
|head life stage=mature
|head structure=pappus
|involucre external texture=arachnoid tomentose;glabrate
|involucre shape=ovoid;campanulate
|lobe architecture=pistillate
|lobe arrangement=separated
|lobe shape=lance-oblong;triangular-ovate;spinulose;few-toothed;few-lobed
|margin architecture or shape=spinulose
|margin shape=plane;revolute;entire;dentate;pinnatifid;entire
|petiole architecture=winged
|petiole life stage=flowering
|phyllary arrangement=imbricate
|phyllary coloration=purple-tinged
|phyllary shape=ovate;linear
|ridge width=narrow
|root location=deep-seated
|spine width=fine
|stem external texture=glabrous;appressed
|stem orientation=erect
|throat size=1
|whole organism habit=colonial
|whole organism life style=perennial
|whole organism reproduction=dioecious;dioecious
|flowering time=summerjun;jul;aug;sep;oct;
|habitat=disturbed sites fields;pastures;roadsides forest openings
}}
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.
Imported from "Imported from" is a predefined property that describes a relation to an imported vocabulary.
apex course	flexuous +
apex orientation	ascending + and spreading +
apex prominence or shape	flat +
array architecture	corymbiform + and paniculiform +
base architecture	winged-petiolate + and sessile +
base architecture or shape	spinulose +
base arrangement	distributed +
base other	principal +
base position	cauline + and distal cauline +
base shape	tapered +, decurrent +, bractlike +, entire +, toothed + and lobed +
base size	larger + and reduced +
blade shape	oblong + and elliptic +
branch orientation	ascending +
bud derivation	adventitious +
chromosome count	34 +
collar variability	differentiated +
corolla architecture	staminate +
corolla coloration	purple +, white + and pink +
corolla length	longer +
cypsela coloration	brown +
face coloration	green +
face count	absent +
face external texture	glabrous +, gray-tomentose + and tomentose +
face orientation	appressed +
face position	adaxial +, basal +, outer + and middle +
face shape	entire +
flowering time	jul +, aug +, sep +, oct + and summerjun +
habitat	pastures +, disturbed sites fields + and roadsides forest openings +
head arrangement	singly + and in corymbiform or paniculiform arrays +
head life stage	mature +
head structure	pappus +
involucre external texture	arachnoid tomentose + and glabrate +
involucre shape	ovoid + and campanulate +
lobe architecture	pistillate +
lobe arrangement	separated +
lobe shape	lance-oblong +, triangular-ovate +, spinulose +, few-toothed + and few-lobed +
margin architecture or shape	spinulose +
margin shape	plane +, revolute +, entire +, dentate + and pinnatifid +
petiole architecture	winged +
petiole life stage	flowering +
phyllary arrangement	imbricate +
phyllary coloration	purple-tinged +
phyllary shape	ovate + and linear +
ridge width	narrow +
root location	deep-seated +
spine width	fine +
stem external texture	glabrous + and appressed +
stem orientation	erect +
throat size	1 +
whole organism habit	colonial +
whole organism life style	perennial +
whole organism reproduction	dioecious +