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Conyza canadensis (L.) Cronquist var. pusilla (Nutt.) Cronquist

Weedy herb, to 2 m tall (or taller); leaves alternate, simple, linear, margins entire and ciliate, apex acute; inflorescence a panicle of numerous small heads; fruits achenes, with parachute like bristles of the calyx (pappus) at their apices.

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