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|Family: Amaranthaceae||View Description||Dichotomous Key|
|Genus: Amaranthus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Amaranthus powellii S. Watson
Habit: Monoecious. Stem: erect, 25--150(200) cm, branched or not, green with purple stripes, +- glabrous. Leaf: petiole 30--60 mm; blade 30--80 mm, 20--50 mm wide, elliptic to rhombic or widely lanceolate, base wedge-shaped, margins flat, tip +- obtuse. Inflorescence: terminal, erect, generally with a few rigid-erect branches (well-branched, dense panicle), (3)4--12 cm, 1.2--1.6 cm wide (including flowers); green to pale green; bracts 4.5--6(8) mm, 2--3(4) × > perianth, spine-like, narrowly triangular to lanceolate. Flower: staminate generally at inflorescence tips, perianth parts 3--5, +- equal, lanceolate, acute, stamens 3--5; pistillate perianth parts 3--5, unequal, longest 2.3--3.5 mm, others 1.2--2 mm, oblong to lance-linear, tip acute to awned; stigmas 2--3, spreading. Fruit: circumscissile or indehiscent; 2--3 mm, ovoid, generally > perianth parts, +- wrinkled near tip, +- smooth when indehiscent, gray-cream to light brown. Seed: 0.9--1.3 mm, lenticular, elliptic, ovate, dark brown to black, smooth, shiny. Chromosomes: 2n=32,34.
Ecology: Agricultural fields, disturbed areas; Elevation: < 1500 m. Bioregional Distribution: NCoRO, CaRH, SNF, n&c SNH, GV, CW, SW, W&I, MP; Distribution Outside California: native to southwestern United States, adjacent Mexico; +- cosmopolitan weed. Flowering Time: Jun--Oct
eFlora Treatment Author: Mihai Costea
Jepson Online Interchange
Previous taxon: Amaranthus palmeri
Next taxon: Amaranthus retroflexus
Citation for this treatment: Mihai Costea 2016. Amaranthus powellii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=12936, accessed on December 05, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on December 05, 2016.