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Canada Thistle

(Cirsium arvense L.)

Asteraceae (Sunflower Family)


small flowering Canada thistle

young shoots from creeping roots ▲▼

short, thin, upright, slightly branched stems of pre-flowering plants

flowering plants with small inflorescences (usually 1" diameter or smaller)

large 30+ foot diameter clonal colony of Canada thistle in Minnesota ▲▼

fruit of Canada thistle

creeping root system of Canada thistle

Canada thistle:  (pp. 132-133, Weeds of the Northeast; pp. 108-109, Weeds of the Great Plains)

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