Euphorbia rayturneri

V. W. Steinmann & Jercinovic

Novon 22: 482, figs. 1, 2. 2013.

EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 286. Mentioned on page 253.

Herbs, annual, with slender taproot. Stems prostrate, 4–8 cm, uniformly strigillose. Leaves opposite; stipules distinct, filiform, 0.6–0.9 mm, pilose; petiole 0.5–0.9 mm, strigillose; blade ovate to elliptic, often slightly falcate, 5–11 × 2–5 mm, base asymmetric, one side cordate, other round to attenuate, margins sharply serrulate, apex acute, surfaces often with red spot toward middle, abaxial surface strigillose, adaxial surface glabrescent; only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 0.5–1.6 mm. Involucre obconic, 0.9–1.2 × 0.8–1.2 mm, strigillose; glands 4, green, yellow, or light pink, circular to oblong, 0.2 × 0.2–0.3 mm; appendages absent or green, yellow, or light pink, forming narrow margin on distal portion of gland, 0–0.1 × 0.2–0.3 mm, distal margin entire. Staminate flowers 5–8. Pistillate flowers: ovary strigillose-canescent; styles 0.3–0.4 mm, unbranched. Capsules oblate, 1.7–2 × 2.2–2.7 mm, strigillose; columella 1.5–1.9 mm. Seeds blackish brown, broadly ovoid, 3-angled in cross-section, 1.2–1.4 × 1–1.1 mm, with 2 well-defined transverse ridges that do not pass through abaxial keel. 2n = 14.


Phenology: Flowering and fruiting late summer–early fall.
Habitat: Desert grasslands.
Elevation: 1400–1700 m.

Discussion

Euphorbia rayturneri is known from only three collections in extreme southwestern New Mexico. Given its close proximity to the Mexican border, the species may also occur in the adjacent states of Chihuahua or Sonora.

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 rayturneri"
light pink;yellow;light pink;yellow;green +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
V. W. Steinmann & Jercinovic +
Anisophyllum +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
falcate;ovate;elliptic +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
1400–1700 m. +
pistillate +  and staminate +
light pink +, yellow +  and green +
subtending +
circular +  and oblong +
0.2mm +  and 0.3mm +
Desert grasslands. +
axillary +  and terminal +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
caducous +, deciduous +  and persistent +
bractlike +
palmate +  and pinnate +
toothed +  and entire +
strigillose-canescent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
connate;distinct +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Flowering and fruiting late summer–early fall. +
well-defined +
blackish brown +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
3-angled +  and ovoid +
0.1 cm1 mm <br />0.001 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
round +  and attenuate +
Endemic +  and Conservation concern +
free +, connate +  and distinct +
decumbent +, reclining +, ascending +  and erect +
strigillose +
flattened +  and terete +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
interpetiolar +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
connate +  and distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +
hairy +  and glabrous +
Chamaesyce +
Euphorbia rayturneri +
Euphorbia sect. Anisophyllum +
species +
axillary +  and terminal +
10 +, 9 +, 8 +, 7 +  and 6 +