Atriplex powellii

S. Watson

Proc. Amer. Acad. Arts 9: 114. 1874.

Common names: Powell’s orach
Endemic
Synonyms: Obione powellii (S. Watson) Ulbrich
Treatment appears in FNA Volume 4. Treatment on page 352. Mentioned on page 327, 328.

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 panduriform, 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.

Distribution

V4 677-distribution-map.gif

Alta., Sask., Ariz., Colo., Idaho, Mont., N.Mex., Nebr., Oreg., S.Dak., Utah, Wyo.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

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 Atriplex powellii var. powellii
1 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. Atriplex powellii var. minuticarpa

"dm" is not declared as a valid unit of measurement for this property.

... more about "Atriplex powellii"
Stanley L. Welsh +
S. Watson +
slippery +
aromatic +
rounded +  and cuneate +
Argenteae +
0.4 cm4 mm <br />0.004 m <br /> (5 cm50 mm <br />0.05 m <br />) +
ovate +  and rhombic or orbiculate +
0.2cm;3cm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
0 +  and 1/2 +
cuneate +  and ovate or obovate +
4-5-lobed +
Powell’s orach +
Alta. +, Sask. +, Ariz. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Nebr. +, Oreg. +, S.Dak. +, Utah +  and Wyo. +
smooth +  and tuberculate +
rarely +  and lacking +
unisexual +  and bisexual +
not +  and connate +
enlarged +
arachnoid +  and scurfy +
bladderlike +
terminal +  and axillary +
petiolate +  and sessile +
deciduous +  and persistent +
not winged +  and winged +
lobed +  and serrate-dentate +
stipitate +, sessile +  and monomorphic +
inferior +, half-inferior +  and superior +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
(1-)3-5-lobed +
papery +  and chartaceous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
tridentate +  and cuspidate +
petiolate +, short +  and subsessile +
Proc. Amer. Acad. Arts +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
flattened +
cylindric +
3 (?) +  and 5 (?) +
opposite +  and alternate +
slender +  and stout +
succulent +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
tridentate +  and cuspidate +
Obione powellii +
Atriplex powellii +
Atriplex subsect. Argenteae +
species +
dicotyledonous +
monoecious +  and dioecious +