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Martin, Edwin M.
Amaranthus spinosus L.
Spiny amaranth, Thorny pigweed
USDA Symbol: AMSP
Tiny, yellow-green flowers on a stout, much-branched, sometimes reddish stem. Amaranthus species, though regarded as common weeds, produce tremendous numbers of seed-like fruit, which are an important food for many songbirds.
The Amaranthaceae are a family of annual or perennial herbs with small, crowded flowers. There are usually 5 sepals and no petals. Filaments of the stamens are often united into a short tube.
Plant CharacteristicsDuration: Annual Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Time: Jul , Aug , Sep , Oct
, WV Native Distribution:
Manitoba and Ontario; Maine south to Florida, west to Texas, and north to Minnesota. Native Habitat:
Waste places, disturbed ground, and cultivated soil.
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Herbarium Specimen(s)NPSOT 0731
Collected Sep 13, 1992 in Bexar County by Harry Cliffe
Record Last Modified: 2008-12-17
Research By: TWC Staff