Flora of North America species comparison

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Atriplex confertifolia

Atriplex pleiantha

shadscale, shadscale saltbush, sheepfat, spiny saltbush

four-corners orach
Habit Shrubs, dioecious, 3–8 dm, spinescent. Herbs, branching from base, mainly 0.5–1.5 dm, glabrous or sparingly scurfy.
Leaves

persistent, alternate;

petiole 1–4 mm;

blade orbiculate to ovate, elliptic, or oval, 9–25(–45) × 4–20(–25) mm, margin entire, apex obtuse.

alternate to subopposite, petiolate;

blade ovate to suborbiculate, 5–18(–20) mm, about as wide, margin entire, apex obtuse to acute.
Staminate flowers

yellow, in clusters 2–4 mm wide or in spikes to 1 cm, axillary, in foliose-bracteate, divaricately branched panicles 3–15 cm.

in short terminal spikes.
Pistillate flowers

in similar paniculate inflorescences.

Seeds

1.5–2 mm wide.

falling at maturity, black, 1.5 mm, shining, smooth.
Fruiting

bracteoles sessile or subsessile, suborbiculate to rhombic or elliptic, 4–12 mm and wide, body indurate, terminal teeth distinct, foliaceous, shorter than bracteoles, entire or toothed below, terminal teeth spreading at maturity, faces smooth, lacking appendages.

bracteoles short stipitate, compressed, 3–7 mm wide and about as long, entire;

perianth consisting of 5 hyaline, sparsely ciliate scales 1–1.2 mm.
2n

= 18, 36, 54+.

Atriplex confertifolia

Atriplex pleiantha
Phenology Flowering spring–fall. Flowering late summer–fall.
Habitat Gravelly to fine-textured soils in greasewood, mat-atriplex, other salt desert shrub, sagebrush, pinyon-juniper, and ponderosa pine communities Salt-desert shrub community
Elevation 600-2200 m (2000-7200 ft) 1400-1500 m (4600-4900 ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; ND; NM; NV; OR; TX; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM; UT
Discussion

Shadscale forms hybrids with Atriplex canescens, A. garrettii, A. corrugata, and A. gardneri varieties. It is, however, closely allied to A. parryi and A. spinifera. The plants are widely dispersed, typically on saline substrates but less commonly on essentially non-saline ones, through large areas of the western United States and adjacent Canada and Mexico, on both raw and exposed geological strata and on alluvium.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 4. FNA vol. 4, p. 345.
Parent taxa Chenopodiaceae > Atriplex > subg. Pterochiton Chenopodiaceae > Atriplex > subg. Obione > sect. Pleianthae
Sibling taxa
A. acanthocarpa, A. amnicola, A. argentea, A. californica, A. canescens, A. cordulata, A. coronata, A. corrugata, A. coulteri, A. covillei, A. dioica, A. elegans, A. fruticulosa, A. gardneri, A. garrettii, A. glabriuscula, A. gmelinii, A. graciliflora, A. heterosperma, A. holocarpa, A. hortensis, A. hymenelytra, A. joaquiniana, A. klebergorum, A. laciniata, A. lentiformis, A. leucophylla, A. lindleyi, A. linearis, A. littoralis, A. matamorensis, A. mucronata, A. nudicaulis, A. nummularia, A. oblongifolia, A. obovata, A. pacifica, A. parishii, A. parryi, A. patula, A. pentandra, A. phyllostegia, A. pleiantha, A. polycarpa, A. powellii, A. prostrata, A. pusilla, A. rosea, A. saccaria, A. semibaccata, A. serenana, A. spinifera, A. suberecta, A. suckleyi, A. tatarica, A. torreyi, A. truncata, A. tularensis, A. watsonii, A. wolfii, A. wrightii
A. acanthocarpa, A. amnicola, A. argentea, A. californica, A. canescens, A. confertifolia, A. cordulata, A. coronata, A. corrugata, A. coulteri, A. covillei, A. dioica, A. elegans, A. fruticulosa, A. gardneri, A. garrettii, A. glabriuscula, A. gmelinii, A. graciliflora, A. heterosperma, A. holocarpa, A. hortensis, A. hymenelytra, A. joaquiniana, A. klebergorum, A. laciniata, A. lentiformis, A. leucophylla, A. lindleyi, A. linearis, A. littoralis, A. matamorensis, A. mucronata, A. nudicaulis, A. nummularia, A. oblongifolia, A. obovata, A. pacifica, A. parishii, A. parryi, A. patula, A. pentandra, A. phyllostegia, A. polycarpa, A. powellii, A. prostrata, A. pusilla, A. rosea, A. saccaria, A. semibaccata, A. serenana, A. spinifera, A. suberecta, A. suckleyi, A. tatarica, A. torreyi, A. truncata, A. tularensis, A. watsonii, A. wolfii, A. wrightii
Synonyms Obione confertifolia, A. collina, A. subconferta, Obione rigida Proatriplex pleiantha
Name authority (Torrey & Frémont) S. Watson: Proc. Amer. Acad. Arts 9: 119. (1874) W. A. Weber: Madroño 10: 189, figs. 1, 2. (1950)
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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