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

28. Fabaceae, the Bean Family

1. Amorpha L.

1. Amorpha fruticosa L. -- False indigo


Branching shrub mostly 1-3 m tall; twigs tan to gray. Leaves once-pinnate, the blade oblong, 6-16 cm long; leaflets 9-27, elliptic to obovate, 1-4 cm long, 4-28 mm wide, glabrous above, puberulent and sometimes punctate beneath, on petiolules 1-3 mm long; petioles 2-5 cm long; stipules none. Inflorescence of 2-several, terminal, dense, spikelike racemes, these 2-15 cm long, the raceme axis and pedicels puberulent; bracts lanceolate, shorter than the calyx, pubescent, deciduous; pedicels 1-2 mm long. Flowers dark purple, irregular; calyx campanulate, unequally and shallowly 5-toothed, 1.5-3 mm long, often glandular, the lowest tooth somewhat longer and narrower than the others; corolla 1-lobed, only the standard present, folded to enclose the stamens, 3-5 mm long; stamens 10, the filaments united near the base. Fruits indehiscent, oblong, curved upward, 5-7 mm long, strongly glandular, 1- to 2-seeded. Flowering Jun, fruiting late Jul--Sep. Wet meadows, stream banks, shores, ditches and floodplains; frequent from e and c ND through NE; (PA to Sask., s to AL and n Mex.).
GIF- Species Photo/Drawing
GIF- Distribution Map

Map key

Amorpha fruticosa, flowering and vegetative branches.  

Return to Family -- Fabaceae - The Bean Family
Next Species -- Desmodium canadense (L.) DC. -- Canada tickclover

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/vascplnt/species/amor.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:39:55 EST
Sioux Falls, SD [sdww55]