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Bidens cernua - (image 1 of 4)

Taxonomy

Family: Asteraceae

Habitat

Muddy shores of ponds and streams. Occasionally in boggy areas.

Associates

Asclepias incarnata, Bidens coronata, Carex crinita, Cicuta bulbifera, Impatiens capensis, Juncus effusus, Leersia oryzoides, Lemna minor, Sagittaria latifolia, Typha latifolia

Distribution

Widespread in temperate North America.

Morphology

Annual with glabrous or scabrous hispid stems 0.1-1.0 m. Leaves opposite, simple, sessile to connate, serrate. Flower heads usually nodding in fruit; achenes with a convex, cartilaginous summit; flowers bright yellow, almost greenish.      

Notes

Flowers mid June to early October

Wetland indicator: Obligate

This plant can become dominant following destruction of shoreline vegetation or after shoreline reconstruction.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois

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