horseweed2-small.jpg

Marestail

Other names: Horseweed, Canadian horseweed, horseweed fleabane
Life cycle: Winter or summer annual
Found in: Cropland, pastures, orchards, fallow fields, waste areas and roadsides throughout the U.S.
General description: Erect hairy plant with toothed leaves that grows up to 6½ feet high.
Seedlings: Cotyledons are oval and tiny. Young leaves are egg-shaped with toothed edges and
develop hair as they mature.
True leaves: Alternate, linear, usually toothed and about 4" long. They are crowded along the stem and hairy, and become smaller as they go up the stem.
Flowers and fruit: Flowers are small, inconspicuous white rays or yellow disks that occur at the top of the stem. Fruit is small, white, bristly and wind-dispersed.

Special note: Exhibits glyphosate resistance.

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