Euphorbia cinerascens

Engelmann in W. H. Emory

Rep. U.S. Mex. Bound. 2(1): 186. 1859.

Common names: Ashy sandmat
Synonyms: Chamaesyce cinerascens (Engelmann) Small
Treatment appears in FNA Volume 12. Treatment on page 264. Mentioned on page 254, 277.

Herbs, perennial, with moderately to strongly thickened rootstock. Stems prostrate to decumbent, mat-forming, 5–30 cm, appressed wooly, strigillose, or short-sericeous. Leaves opposite; stipules distinct, subulate, 0.2–0.5 mm, appressed wooly to sericeous; petiole 0.3–0.8 mm, appressed wooly to sericeous; blade ovate to elliptic, 1.5–5.5 × 1.3–4 mm, base asymmetric, obtuse to hemicordate, margins entire often reddish, apex usually obtuse, occasionally acute (young leaves), surfaces sericeous to strigillose or slightly pilose, adaxial surface often glabrous; 3-veined from base but only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 0.2–0.3 mm. Involucre turbinate, 0.8–1.3 × 1.2–2 mm, appressed wooly, sericeous, or strigillose; glands 4, purple-black, elliptic to oblong, 0.2–0.3 × 0.4–0.6 mm; appendages absent or reddish-pink, forming narrow rim around distal margin of gland, 0–0.1 × 0–0.6 mm, distal margin entire, crenulate, or erose. Staminate flowers 15–20. Pistillate flowers: ovary canescent; styles 0.3–0.5 mm, 2-fid at apex. Capsules subglobose to broadly ovoid, 1.3–1.7 × 1.5–1.8 mm, canescent; columella 1–1.3 mm. Seeds white to pinkish or light-brown, ovoid, 4-angled in cross-section, 1–1.4 × 0.6–0.8 mm, smooth to rugulose or rarely with 1–2 inconspicuous transverse ridges. 2n = 32.


Phenology: Flowering and fruiting year-round (mostly spring–fall).
Habitat: Desert scrub, oak and juniper woodlands, thorn scrub, shrublands, grasslands, frequently on limestone substrates.
Elevation: 70–1400 m.

Distribution

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Tex., Mexico

Discussion

In the flora area, Euphorbia cinerascens is found only in southern and western Texas. In Mexico, it is found from Chihuahua east to Tamaulipas, south to Guanajuato.

Selected References

None.

Lower Taxa

None.

"connate" is not a number. "distinct" is not a number."connate" is not a number. "distinct" is not a number.

... more about "Euphorbia cinerascens"
acute;obtuse +
0 cm0 mm <br />0 m <br /> - 0.01 cm0.1 mm <br />1.0e-4 m <br /> +
0 cm0 mm <br />0 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Engelmann in W. H. Emory +
Anisophyllum +
0.15 cm1.5 mm <br />0.0015 m <br /> - 0.55 cm5.5 mm <br />0.0055 m <br /> +
ovate;elliptic +
0.13 cm1.3 mm <br />0.0013 m <br /> - 0.4 cm4 mm <br />0.004 m <br /> +
0.13 cm1.3 mm <br />0.0013 m <br /> - 0.17 cm1.7 mm <br />0.0017 m <br /> +
subglobose +  and broadly ovoid +
0.15 cm1.5 mm <br />0.0015 m <br /> - 0.18 cm1.8 mm <br />0.0018 m <br /> +
0.1 cm1 mm <br />0.001 m <br /> - 0.13 cm1.3 mm <br />0.0013 m <br /> +
Ashy sandmat +
Tex. +  and Mexico +
70–1400 m. +
pistillate +  and staminate +
purple-black +
0.2mm;0.3mm +
subtending +
elliptic +  and oblong +
0.4mm +  and 0.6mm +
Desert scrub, oak and juniper woodlands, thorn scrub, shrublands, grasslands, frequently on limestone substrates. +
axillary +  and terminal +
0.08 cm0.8 mm <br />8.0e-4 m <br /> - 0.13 cm1.3 mm <br />0.0013 m <br /> +
strigillose +, sericeous +, wooly +  and appressed +
0.12 cm1.2 mm <br />0.0012 m <br /> - 0.2 cm2 mm <br />0.002 m <br /> +
caducous +, deciduous +  and persistent +
bractlike +
palmate +  and pinnate +
toothed +  and entire +
0.02 cm0.2 mm <br />2.0e-4 m <br /> - 0.03 cm0.3 mm <br />3.0e-4 m <br /> +
connate;distinct +
wooly +  and sericeous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> - 0.08 cm0.8 mm <br />8.0e-4 m <br /> +
Flowering and fruiting year-round - mostly spring–fall. +
Rep. U.S. Mex. Bound. +
inconspicuous +
1 +  and 2 +
white;pinkish or light-brown +
0.1 cm1 mm <br />0.001 m <br /> - 0.14 cm1.4 mm <br />0.0014 m <br /> +
rarely +, smooth +  and rugulose +
4-angled +  and ovoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> - 0.08 cm0.8 mm <br />8.0e-4 m <br /> +
free +, connate +  and distinct +
mat-forming +
decumbent +, reclining +, ascending +  and erect +
prostrate to decumbent +
short-sericeous +, strigillose +, wooly +  and appressed +
flattened +  and terete +
5 cm50 mm <br />0.05 m <br /> - 30 cm300 mm <br />0.3 m <br /> +
interpetiolar +
wooly +  and sericeous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> - 0.05 cm0.5 mm <br />5.0e-4 m <br /> +
connate +  and distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> - ? +  and 0.05 cm0.5 mm <br />5.0e-4 m <br /> - ? +
sericeous +  and strigillose or slightly pilose +
Chamaesyce cinerascens +
Euphorbia cinerascens +
Euphorbia sect. Anisophyllum +
species +
axillary +  and terminal +
10 +, 9 +, 8 +, 7 +  and 6 +