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FNA | Family List | FNA Vol. 4 | Chenopodiaceae | Atriplex

26. Atriplex powellii S. Watson, Proc. Amer. Acad. Arts. 9: 114. 1874.

Powell’s orach

Obione powellii (S. Watson) Ulbrich

Herbs, dioecious or sometimes sparingly monoecious. Stems slender to stout, mainly 1-5(-7) dm, branching almost throughout; herbage pubescent with scurfy and arachnoid hairs. Leaves alternate, proximalmost on petioles (3-)5-30 mm, becoming subsessile or short petiolate distally; blade 3-veined, ovate to rhombic or orbiculate to elliptic, 0.4-5 × 0.2-3 cm, base rounded to cuneate, margin entire, apex acute to obtuse. Staminate flowers with calyx 4-5-lobed. Fruiting bracteoles sessile, ovate to oblong or broadly cuneate or pan-duriform, 1.5-5.5 × 1.5-5 mm, thick, united to apex, apex truncate to cuspidate or tridentate, surfaces with thickened processes or rarely smooth. Seeds greenish, yellowish, or brown, 0.9-2 mm; radicle superior. 2n = 18.

Varieties 2 (2 in the flora): w North America.

1 Leaves mostly conspicuously 3-veined, proximalmost with petioles 0.5-2.5(-3.5) cm, distalmost bracteate leaves typically short petiolate; fruiting bracteoles easily discerned at bract bases; plants mostly dioecious; from Alberta and Saskatchewan s to Utah and New Mexico.......   26a var. powellii
+ Leaves inconspicuously, if at all, 3-veined, proximalmost with petioles 0.5-1.5(-2) cm, distalmost bracteate leaves typically sessile; fruiting bracteoles apparent only by removing the subtending bract; plants evidently monoecious; local distribution in se Utah.   26b var. minuticarpa


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