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Close-up of flower and leaf

Bidens cernua

Common Name: Nodding Bur-Marigold
Family: Asteraceae
 


Entry Author:  J. Rogers and C. Westring
Description: An annual herb.  "Cernua" in Latin means "nodding".
Leaves:  Smooth, stalkless, lance-shaped leaves; margins are coarsely toothed; 3-16 cm long and 0.5-5 cm wide.
Flowers:
 
6-8 showy yellow rays 2.5 cm in length.  Each flower is 5 cm in diameter.  Flowers nod, or droop, increasingly with age. Center disk consists of darker yellow tubular structures.  Often fringed with hair.
Seeds: 
Flat,  four pronged seeds (achenes) that are broadest at top tapering to a narrow base.
Stem: Erect or sometimes growing along the ground and rooting at the nodes; smooth or hairy; often branched
Branching Pattern:
Opposite
Height: 30-90 cm
Conditions/Habitat/Kind of Forest: Sedge meadows, sandy or muddy shores, marshes, stream banks, and other wet places.
Range: Most of U.S. except parts of the Southeast
Conservation Status-US/ World Wide: Invasive 
Uses (Human):  Used in meadow landscaping and wetlands restoration

References: 

Chadde, Steve W.  A Great Lakes Wetland Flora (2nd ed.)  Michigan: PocketFlora Press, 2002.

Peterson, Roger Tory, and Margaret McKenny.  Peterson Field Guides:  A field guide to Wildflowers of Northeastern and Northcentral North America.  New York: Houghton Mifflin Co., 1968.

Rook, E.  Aquatic Plants of the North: Bidens cernua.   February 26, 2004.  Accessed: November 29, 2005.  <http://www.rook.org/earl/bwca/nature/aquatics/bidenscer.html>

This page was created by: J. Chichester, Northampton Community College, and K. Rice and C. Westring, Muhlenberg College
Last updated 12/21/05