USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Aquatic and Wetland Vascular Plants of the Northern Great Plains

49. Asteraceae, the Aster Family

3. Bidens L. -- Beggarticks

1. Bidens bipinnata L. -- Spanish needles

Erect, branching annual 3-12(17) dm tall, glabrous or seldom hispidulous. Leaves pinnate-pinnatifid to bipinnate, 4-20 cm long including the petiole which is 2-5 cm long, the leaflets ovate to oblong and deeply lobed, lobes acute to nearly rounded. Heads inconspicuously radiate, appearing discoid, 4-6 mm across; outer involucral bracts 7-10, linear, acute, shorter than the inner ones; rays yellowish-white and dark striate, less than 5 mm long, not exceeding the disk florets. Achenes with (2)3-4 retrorsely barbed, yellowish awns, the body brown to blackish, linear, mostly 10-18 mm long and much surpassing the involucre or the outermost achenes shorter. Aug--Oct. Moist to wet disturbed areas and shores; uncommon in e NE, probably as a sporadic introduction from farther s; (MA to NE s to FL, TX, AZ and into Mex.; also S.Amer. and intro. in the Old World).
GIF- Distribution Map

Map key

Previous Section -- Aster simplex Willd. -- Panicled aster
Return to Family -- Asteraceae - The Aster Family
Next Section -- Bidens cernua L. -- Nodding beggarticks

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:40:15 EST
Sioux Falls, SD [sdww55]