Atriplex argentea var. hillmanii

M. E. Jones

Contr. W. Bot. 11: 21. 1903.

Common names: Hillman’s orach
Endemic
Synonyms: Atriplex hillmanii (M. E. Jones) Standley
Treatment appears in FNA Volume 4. Treatment on page 351. Mentioned on page 350, 352.

Stems spreading or ascending, densely branched, forming low broad clumps, 1.5–3 (–4.5) dm. Leaves: blade ovate-oval, triangular, or oval to broadly oblong or rhombic-orbicular, 8–30 mm, base acute to subtruncate, margin entire or less commonly irregularly dentate, grayish scurfy. Fruiting bracteoles sessile or rarely some short stipitate (stipe to 2 mm), ovate to obovate, suborbicular, or cuneate in profile, compressed or thickened, 3.5–6.2 × 3.7–7.2 mm, margin deeply and acutely dentate, faces naked or covered with numerous short-to-elongate, flattened appendages. 2n = 18, 36, 54.


Phenology: Flowering summer–fall.
Habitat: Dry or moist saline, silt or clay substrates mainly in valley bottoms
Elevation: 1000-1800 m

Discussion

Atriplex argentea var. hillmanii often occurs with Sarcobatus, Atriplex spp., Halogeton, Salsola, and Chrysothamnus. The features used to distinguish this taxon from var. argentea center on the mostly sessile fruiting bracteoles, which typically bear acute-attenuate or acuminate processes, and on the tendency of the plants to grow in depressed low clumps mainly less than 3 dm tall. These features are not always consistent, and neither are they consistently associated. Some plants bear occasional short stipitate fruiting bracteoles, and in some the appendages are merely acute. Examples of much taller plants are also known. Despite the lack of totally consistent characteristics, the entity has a geographic basis, with western Nevada at its approximate center and minor extensions into adjacent southeastern California and southeastern Oregon.

Selected References

None.

Lower Taxa

None.

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

54 +, 36 +  and 18 +
Stanley L. Welsh +
M. E. Jones +
slippery +
aromatic +
acute to subtruncate +
Argenteae +
5 cm50 mm <br />0.05 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
oval +  and broadly oblong or rhombic-orbicular +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
4mm;50mm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
0 +  and 1/2 +
cuneate +  and ovate or obovate +
4-5-parted +
Hillman’s orach +
subsessile +  and bracteate +
Calif. +, Nev. +  and Oreg. +
1000-1800 m +
covered with numerous short-to-elongate , flattened appendages +  and naked +
tuberculate +
crested +
rarely +  and lacking +
unisexual +  and bisexual +
not +  and connate +
enlarged +
Dry or moist saline, silt or clay substrates mainly in valley bottoms +
bladderlike +
terminal +  and axillary +
deciduous +  and persistent +
dentate +  and entire +
dentate +  and laciniate +
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 +
Flowering summer–fall. +
sessile +  and petiolate +
Contr. W. Bot. +
lateral +  and superior +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
flattened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
cylindric +
3 (?) +  and 5 (?) +
opposite +  and alternate +
ascending +  and spreading +
succulent +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Atriplex hillmanii +
Atriplex argentea var. hillmanii +
Atriplex argentea +
variety +
dicotyledonous +
stipitate +  and sessile +
compressed;ovate;obovate suborbicular or cuneate +
branched +  and simple +