Atriplex wolfii var. tenuissima

(A. Nelson) S. L. Welsh

Rhodora 102: 422. 2001.

Endemic
Basionym: Atriplex tenuissima A. Nelson Bot. Gaz. 34: 359. 1902
Synonyms: Atriplex greenei A. Nelson Atriplex tenuissima var. greenei (A. Nelson) Fosberg Obione tenuissima
Treatment appears in FNA Volume 4. Treatment on page 355.

Stems erect, intricately branched, 0.5–3 dm. Leaves: proximalmost blade linear, 4–20 × 2–3 mm, distalmost blade bracteate, sometimes ovate or ovatelanceolate, densely grayish scurfy. Staminate flowers confined to a few distal axils. Fruiting bracteoles ovate or ovatelanceolate in profile, (1.8–) 2.3–2.7 × 1.5–2.1 mm, distal lobe typically larger and broader than lateral lobes, terminal tooth typically much largest or with this apparently displaced laterally.


Phenology: Flowering summer–fall.
Habitat: Plants of saline bottoms, often in margins of marshy areas with salt grass, greasewood, and seepweed
Elevation: 1500-2300 m

Discussion

Specimens cited by H. M. Hall and F. E. Clements (1923) from central Utah within their concept of Atriplex wolfii in a strict sense have fruiting bracteoles in which the terminal, or apparently terminal, cusp is off-set from the median position, thus appearing to be lateral and lacking a terminal cusp. Other materials cited by them away from the south-central Colorado type locality of var. tenuissima bear bracteoles with a similar displacement of the terminal cusp. Hall and Clements placed such specimens within A. wolfii. Bracts of that type are unmatched among the materials of var. wolfii in southern Colorado. As interpreted here, the plants belong to var. tenuissima.

Selected References

None.

Lower Taxa

None.

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

subsessile +, sessile +  and monomorphic +
Stanley L. Welsh +
(A. Nelson) S. L. Welsh +
slippery +
aromatic +
Atriplex tenuissima +
concolorous +
0.4 cm4 mm <br />0.004 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
linear +  and narrowly lanceolate +
1mm;3mm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
0 +  and 1/2 +
cuneate +  and ovate or obovate +
3-5-parted +
typically larger and broader +
ovatelanceolate +  and ovate +
Colo. +, Utah +  and Wyo. +
1500-2300 m +
tuberculate +  and smooth +
rarely +  and lacking +
unisexual +  and bisexual +
not +  and connate +
enlarged +
Plants of saline bottoms, often in margins of marshy areas with salt grass, greasewood, and seepweed +
bladderlike +
terminal +  and axillary +
deciduous +  and persistent +
not winged +  and winged +
entire +  and serrate +
lobed +  and serrate-dentate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
ovate +  and cuneate +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
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. +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
flattened +
cylindric +
3 (?) +  and 5 (?) +
opposite +  and alternate +
succulent +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Atriplex greenei +, Atriplex tenuissima var. greenei +  and Obione tenuissima +
Atriplex wolfii var. tenuissima +
Atriplex wolfii +
variety +
dicotyledonous +
ovatelanceolate;ovate +