Atriplex parishii var. subtilis

(Stutz & G. L. Chu) S. L. Welsh

Rhodora 102: 423. 2001.

Common names: Subtle orach
EndemicConservation concern
Basionyms: Atriplex subtilis Stutz & G. L. Chu Madroño 44: 184, figs. 1, 2a. 1997
Treatment appears in FNA Volume 4. Treatment on page 357. Mentioned on page 356, 358.

Stems erect, much branched, 1–3 dm, densely scurfy; branches opposite, often purple-reddish, neither ribbed nor striate; internodes 5–15 mm. Leaves mostly opposite, sessile; blade ovate-triangular to broadly ovate, 2–4 × 1–3 mm, mostly cordate-clasping, densely scurfy on both sides. Flowers of both sexes intermixed in axillary glomerules, but sometimes staminate clustered toward apex. Fruiting bracteoles persistent, deltoid, 2.4–2.8 mm and wide, margin with 1–3 pairs of irregular teeth, proximalmost usually larger and retrorse, apex shortly acuminate, with 2 longitudinal rows of tubercles on 1 or both surfaces. Seeds dark-brown.


Phenology: Flowering late spring–fall.
Habitat: Saline depressions, often within or later growing in depressions of vernal pools
Elevation: 40-100 m

Discussion

Of conservation concern.

Atriplex depressa var. subtilis occurs with Allenrolfea occidentalis, Distichlis spicata, Centromadia pungens, Suaeda Moquin-Tandonii, Spergularia macrotheca, Frankenia salina, and Sporobolus airoides and other Atriplex spp. Stutz and Chu compared this variety with Atriplex depressa, with whose more northern range in the Central Valley it is contiguous. The leaves are relatively small and the stems are thin. Plants of var. subtilis appear very much like an elongated, gracile form of var. parishii.

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property."/2" is not declared as a valid unit of measurement for this property."broader" is not a number. "broad" is not a number. "broader" is not a number. "broad" is not a number."wide" is not a number.

broadest +
Stanley L. Welsh +
(Stutz & G. L. Chu) S. L. Welsh +
slippery +
aromatic +
mostly rounded +  and cordate +
Atriplex subtilis +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
ovate-triangular +  and broadly ovate +
1mm;3mm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
0 +  and 1/2 +
cuneate +  and ovate or obovate +
purple-reddish +
horizontal +  and ascending +
villous +, scurfy +  and white +
3-5-parted +
Subtle orach +
separated +  and imbricate +
40-100 m +
smooth +  and tuberculate +
rarely +  and lacking +
unisexual +  and bisexual +
not +  and connate +
enlarged +
Saline depressions, often within or later growing in depressions of vernal pools +
bladderlike +
terminal +  and axillary +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 1.5 cm15 mm <br />0.015 m <br /> (?) +
deciduous +  and persistent +
not winged +  and winged +
gray +  and white +
proximalmost +
lobed +  and serrate-dentate +
subsessile +, sessile +  and monomorphic +
hastate +  and ovate +
inferior +, half-inferior +  and superior +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
(1-)3-5-lobed +
papery +  and chartaceous +
Flowering late spring–fall. +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
flattened +
tuberculate +
Endemic +  and Conservation concern +
cylindric +
3 (?) +  and 5 (?) +
opposite +  and alternate +
succulent +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Obione parishii +
Atriplex parishii var. subtilis +
Atriplex parishii +
variety +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
lobed +, compressed +, rhombic +  and ovate +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
dicotyledonous +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
spreading;prostrate +