Flora of North America species comparison

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Atriplex powellii var. powellii

Atriplex subg. Obione
Photo is of parent taxon
Habit Herbs, dioecious or sometimes monoecious, (0.5–)1–5(–7) dm. Plants annual or perennial, monoecious to subdioecious or less commonly dioecious.
Leaves

on petioles 0.3–2.5(–3.5) cm proximally, becoming subsessile (rarely sessile) or more commonly short petiolate distally, blade conspicuously 3-veined, deltoid-ovate to orbicular-ovate or cordate-ovate to elliptic, 5–25(–35) mm and about as wide, base acute or cuneate to obtuse or subcordate, scurfy.

usually with or, uncommonly, without Kranz anatomy.
Flowers

of both sexes intermixed in axillary glomerules, or borne on separate plants.

Staminate flowers

5-merous.

with calyx lobes crested or not.
Pistillate flowers

lacking or rarely with a perianth (in A. covillei, A. pleiantha, and A. suckleyi), enclosed by a pair of bracteoles.
Seeds

yellowish brown or greenish, 1–1.5(–2) mm.

erect;

radicle typically superior (except in A. pleiantha), erect, tip adjacent to styles.
Fruiting

bracteoles sessile, oval to obovate, 1.5–5.5  1.5–5 mm, apical tooth central to 2 rounded lobes, sometimes constricted basally, giving an overall violin shape, sometimes slenderly appendaged marginally and faces often obscured by appendages.

Bracteoles

cuneate to ovate or obovate united at least to middle, faces with tubercles or crests or smooth.

Atriplex powellii var. powellii

Atriplex subg. Obione
Phenology Flowering summer–fall.
Habitat Saline, usually fine-textured clay or silty substrates, in greasewood, rabbitbrush, shadscale, seepweed, mat-atriplex, juniper-pinyon, and blackbrush communities
Elevation 700-2000 m (2300-6600 ft)
Distribution
from FNA
AZ; CO; ID; MT; NE; NM; OR; SD; UT; WY; AB; SK
Mainly w North America; also Old World
Discussion

This rather widely distributed annual approaches being truly dioecious, but in occasional specimens the flowers of the opposite gender are present, intermixed in glomerules, as in Atriplex powellii var. minuticarpa, resulting in monoecious individuals. Peculiar specimens are known which display hemispheric clusters of staminate flowers to 6 mm wide, especially on the west side of the San Rafael Swell in Utah; perhaps they are mere teratological forms. The species sometimes forms extensive stands on raw exposed geological strata in eastern Utah, especially on the Mancos Shale and its subordinate strata.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species ca. 33 (27 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 4, p. 353. FNA vol. 4.
Parent taxa Chenopodiaceae > Atriplex > subg. Obione > sect. Obione > subsect. Argenteae > Atriplex powellii Chenopodiaceae > Atriplex
Sibling taxa
A. powellii var. minuticarpa
Subordinate taxa
Synonyms A. nelsonii, A. philonitra subg. Obione, A. section Obione
Name authority unknown (Gaertner) S. L. Welsh: Rhodora 102: 418. (2001)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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