Vascular Plants of the Gila Wilderness

Presented in Association with the
Western New Mexico University Department of Natural Sciences

Amaranthus palmeri S. Watson
(Carelessweed, Palmer's Amaranth, Pigweed)


Family: Amaranthaceae

Status: Native

Synonyms:
None

Amaranthus palmeri is a very common weedy annual of disturbed ground a lower elevations in the Gila Wilderness. The flower spike is thin and the floral bracts have spines at the tips. The very small flowers develop into single-seeded utricles, a fruit with a membranous wall to which the seed is not connected. The utricle usually is circumscissile, falling away like the tops of Play-Dough eggs used to do. The seeds usually fall easily from the utricle. They are shiny, smooth, and red or black. They seem to develop a central depression over the winter.
Please click on an image for a larger file.



Amaranthus palmeri, photo Russ Kleinman, Burro Mtns., Saddlerock Cyn., June 17, 2007



Amaranthus palmeri, detail of inflorescence, photo Russ Kleinman, Burro Mtns., Saddlerock Cyn., June 17, 2007



Amaranthus palmeri, 3x macro of seed still in bottom of utricle which did not split as regularly as the one next to it, photo Russ Kleinman, Tyrone, Jan. 13, 2009



Amaranthus palmeri, 2x macro of seeds, photo Russ Kleinman, Tyrone, Jan. 13, 2009



Amaranthus palmeri, growth habit, photo Russ Kleinman, Pinos Altos Range, Pinos Altos, September 9, 2011



Amaranthus palmeri, closeup of leaf, photo Russ Kleinman, Pinos Altos Range, Pinos Altos, October 9, 2011



Amaranthus palmeri, alternate leaf arrangement, photo Russ Kleinman, Pinos Altos Range, Pinos Altos, October 9, 2011


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