Euphorbia albomarginata

Torrey & A. Gray in War Department [U.S.]

Pacif. Railr. Rep. 2(4): 174. 1857.

Common names: Rattlesnake weed white-margin sandmat or sandwort
Weedy
Synonyms: Chamaesyce albomarginata (Torrey & A. Gray) Small
Treatment appears in FNA Volume 12. Treatment on page 259. Mentioned on page 256, 260, 271, 287.

Herbs, perennial, with moderately to strongly thickened rootstock. Stems prostrate, occasionally mat-forming, frequently rooting at nodes, 10–80 cm, glabrous. Leaves opposite; stipules connate into conspicuous, deltate or ovate scale, white, 0.4–1 (–2) mm, glabrous; petiole less than 1 mm, glabrous; blade ovate, oblong or orbiculate, 3–8 (–15) × 3–7 mm, base strongly asymmetric, obtuse to hemicordate, margins whitish, entire, apex obtuse, rarely mucronulate, surfaces often with red blotch in center, glabrous; 3-veined from base but usually only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 1–4 mm. Involucre campanulate, 0.8–1.1 × 0.9–2 mm, glabrous; glands 4, greenish yellow to red, usually oblong to reniform, rarely subcircular, 0.2–0.5 × (0.2–) 0.3–0.8 mm; appendages white to pink, flabellate to oblong, 0.3–1 × 0.6–1.3 mm, distal margin entire or crenulate to erose. Staminate flowers 15–30. Pistillate flowers: ovary glabrous; styles 0.3–0.7 mm, 2-fid nearly entire length. Capsules broadly ovoid, 1.1–2.3 × 1.2–2 mm, glabrous; columella 1.1–1.6 mm. Seeds white to gray or brownish red, oblong-ovoid, 4-angled in cross-section, 1–1.7 × 0.5–0.8 mm, smooth.


Phenology: Flowering and fruiting year-round.
Habitat: Disturbed areas in desert scrub, grasslands, mesquite woodlands, chaparral.
Elevation: 0–2300 m.

Distribution

V12 858-distribution-map.jpg

Ariz., Calif., Colo., Nev., N.Mex., Okla., Tex., Utah, Mexico, in Pacific Islands (Hawaii)

Discussion

Euphorbia albomarginata is native to northern and central Mexico and the southwestern and south-central United States. The species occurs in a variety of habitats in western North America and in some areas is quite weedy. It has been recorded as a waif in Louisiana.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia albomarginata"
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
flabellate +  and oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Torrey & A. Gray in War Department [U.S.] +
Anisophyllum +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
orbiculate;oblong;ovate +
3mm;7mm +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Rattlesnake weed +  and white-margin sandmat or sandwort +
crenulate +  and entire +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Okla. +, Tex. +, Utah +, Mexico +  and in Pacific Islands (Hawaii) +
0–2300 m. +
pistillate +  and staminate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
greenish yellow +  and red +
0.2mm;0.5mm +
subtending +
subcircular +, usually oblong +  and reniform +
0.3mm +  and 0.8mm +
Disturbed areas in desert scrub, grasslands, mesquite woodlands, chaparral. +
axillary +  and terminal +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
campanulate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
caducous +, deciduous +  and persistent +
bractlike +
palmate +  and pinnate +
toothed +  and entire +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
connate;distinct +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering and fruiting year-round. +
Pacif. Railr. Rep. +
conspicuous +
ovate +  and deltate +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
4-angled +  and oblong-ovoid +
0.05 cm0.5 mm <br />5.0e-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 +
flattened +  and terete +
10 cm100 mm <br />0.1 m <br /> (80 cm800 mm <br />0.8 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
interpetiolar +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
connate +  and distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.07 cm0.7 mm <br />7.0e-4 m <br /> (?) +
Chamaesyce albomarginata +
Euphorbia albomarginata +
Euphorbia sect. Anisophyllum +
species +
axillary +  and terminal +
10 +, 9 +, 8 +, 7 +  and 6 +