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Conyza canadensis (L.) Cronquist
Canadian horseweed, Horseweed
USDA Symbol: coca5
A coarse weed with erect bristly-haired stem that has branching clusters of small, cup-like, greenish-white flower heads arising from upper leaf axils. The minute white rays do not spread and thus are not showy; the numerous disk flowers are yellow.
An annual that thrives on bare soil, Horseweed is soon crowded out as perennials become established. Originally a North American plant, it has spread to Europe, where it colonizes open disturbed sites. Indians and early settlers used a preparation of its leaves to treat dysentery and sore throat.
Plant CharacteristicsDuration: Annual Habit: Herb Leaf:
Bloom InformationBloom Color: White
Bloom Time: Jul , Aug , Sep , Oct , Nov
, WY Canada: AB
, SK Native Distribution:
Throughout North America, except parts of far north. Native Habitat:
Fields, roadsides, and waste places.
Growing ConditionsWater Use: Medium
Light Requirement: Sun
CaCO3 Tolerance: Low
BenefitConspicuous Flowers: yes
Wildflower Center Seed BankLBJWC-0148
Collected 2007-09-04 in Travis County by Lady Bird Johnson Wildflower Center
Record Last Modified: 2009-09-26
Research By: TWC Staff