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Canadian horseweed
Scientific Name: Conyza canadensis var. glabrata
Family: Asteraceae
Category: Dicot
Growth: Forb/herb
Duration: Annual, Biennial
Other Names:
Canadian Horseweed
Canadian horseweed is a common plant with a rich history and widespread distribution. Here's a look at its key features and characteristics:
Common Names
- Horseweed
- Canadian Fleabane
- Coltstail
- Marestail
- Butterweed
- Canada Fleabane
Scientific Name and Taxonomy
- Accepted Scientific Name: Conyza canadensis (L.) Cronquist
- Family: Asteraceae (or Compositae) - Aster Family
- Order: Asterales
- Synonyms: Erigeron canadensis
- Taxonomic Rank: var. canadensis and var. pusilla
- Note: Conyza canadensis is sometimes referred to as Erigeron canadensis, although the former is currently considered the active name.
Distribution and Habitat
- Native to Canada and the United States.
- Now found throughout the world, including Europe, eastern Russia, parts of Siberia, Central Asia, Iran, Mongolia, Japan, and China.
- Common introduction throughout the United States and Canada.
- Often found as a weed in vacant lots and thrives on bare soil.
Considerations for Pets
- The text mentions that skin contact with the plant can cause known hazards. While the specific hazard is not named, caution should be used to prevent pets from coming into contact with the plant.
Morphological Characteristics
- Erect annual forb, often growing on slightly hairy stems.
- Stems are solitary and unbranched below, occasionally branching above.
- Numerous inconspicuous flower heads, about 1/8 inch across.
- Tiny white or cream-colored composite flowers.
Traditional and Medicinal Uses
- Used by numerous Native North American tribes to treat various illnesses.
- Specifically mentioned for treating stomach pain.
Quirky Facts
- The plant's presence was noted in France 13 years after its discovery, presumably transported via seeds on beaver pelts from Canada.
- The name "Horseweed" may refer to its size, as it can be a tall plant.
Ecological Role
- An annual that thrives on bare soil, often crowded out as perennials become established.
Further Information
- Encyclopedia of Life: Includes articles and information about Erigeron canadensis.
- RHS: Find help and information on Conyza canadensis var. pusilla.
- Dave's Garden: Community sharing tips and ideas for gardens, seeds, and plants.