Rough pigweed is an introduced, coarse, monoecious, annual herb with
taproots. It has an erect stem, 1 to 6.6 feet (0.3-2 m) tall, that is
commonly freely branched. Leaves are 0.8 to 3.9 inches (2-10 cm) long.
Inflorescences are usually densely crowded. There are often additional
dense clusters of flowers in the axils of upper leaves. The fruit is a
Rough pigweed has a taproot. In pinyon-juniper (Pinus-Juniperus)
woodland in New Mexico, root depth averaged 39 inches (100 cm), with a
range of 3.9 to 95 inches (10-240 cm) .
- 11. Fernald, Merritt Lyndon. 1950. Gray's manual of botany. [Corrections supplied by R. C. Rollins]
- 12. Foxx, Teralene S.; Tierney, Gail D. 1987. Rooting patterns in the pinyon-juniper woodland. In: Everett, Richard L., compiler. Proceedings--pinyon-juniper conference; 1986 January 13-16; Reno, NV. Gen. Tech. Rep. INT-215. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station: 69-79. 
- 14. Great Plains Flora Association. 1986. Flora of the Great Plains. Lawrence, KS: University Press of Kansas. 1392 p. 
- 18. Hitchcock, C. Leo; Cronquist, Arthur. 1973. Flora of the Pacific Northwest. Seattle, WA: University of Washington Press. 730 p. 
- 19. Hulten, Eric. 1968. Flora of Alaska and neighboring territories. Stanford, CA: Stanford University Press. 1008 p. 
- 34. Roland, A. E.; Smith, E. C. 1969. The flora of Nova Scotia. Halifax, NS: Nova Scotia Museum. 746 p. 
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