Northeast Wetland Flora
Field Office Guide to Plant Species
Bidens coronata (L.) Britton
- Family: Composite (Compositae)
- Flowering: August-October
- Field Marks: The field marks for this species are the pinnately compound leaves with narrow leaflets and the fruits with flattened but 4-sided unwinged edges, and two short, erect hairy awns.
- Habitat: Moist soil, bogs, wet meadows, wet prairies.
- Habit: Annual or biennial herb with fibrous roots.
- Stems: Upright, branched or unbranched, smooth, slender, up to 5 feet tall.
- Leaves: Opposite, pinnately compound with 3-7 leaflets, the leaflets linear to lanceolate, pointed at the tip, tapering to the base, toothed or shallowly lobed, smooth.
- Flowers: Many flowers in heads, with several heads on smooth stalks up to 6 inches long, each head with numerous yellow rays and numerous yellow disk flowers, the rays oblong, up to 1 1/2 inches long, the disk flowers 1/6-1/4 inch long, each head subtended by usually 3-10 outer bracts.
- Sepals: 0.
- Petals: 5, some united to form yellow rays, others united to form tubular disk flowers.
- Stamens: 5, those within the disk flowers exserted and dark.
- Pistils: Ovary inferior.
- Fruits: Achenes oblongovate, flat, without wings, smooth or slightly hairy, ciliate toward the tip, up to 1/2 inch long, with a pair of stout, hairy awns up to 1/6 inch long.
- Notes: Gleason and Cronquist use the name Asteraceae for this family.
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