Horseweed

(Conyza canadensis)

 

Color Photographs: Copyright Nearctica.com, Inc.

Line Drawing: Britton, N.L., and A. Brown. 1913. An Illustrated Flora of the Northern United States and Canada, Second Edition.

 

Horseweed (Conyza canadensis)

Identification: Flowers small (less than 0.25 inches in diameter), green, with white disk and ray florets barely poking out of the flower head top. Ray florets present, but compressed and not spreading. Flowers extremely numerous and arranged in a number of racemes, arising from the leaf axils. Stem with stiff, erect hairs. Leaves linear and closely crowded on the stem. Plant 1 to 7 feet in height.

Distribution: Throughout North America.

Habitat: Horseweed is a weed of disturbed habitats including fields, roadsides, and empty lots.

Flowering period: July to November.

Horseweed (Conyza canadensis)

Similar Species:

The numerous small flowers in racemes arising from the leaf axils, the bristly stem, and the linear leaves are distinctive features of Horseweed.

Similar Species

No Similar Species