Euphorbia nephradenia

Barneby

Leafl. W. Bot. 10: 314. 1966.

Common names: Paria or Utah spurge
EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 249. Mentioned on page 241, 250.
Revision as of 18:20, 24 September 2019 by FNA>Volume Importer

Herbs, annual, with slender little-branched taproot. Stems erect to ascending, branched, dichotomous distally and slightly angled, 4–25 cm, glabrous or sparsely strigillose. Leaves opposite; stipules 0.1–0.2 mm; petiole 2–6 mm, glabrous or sparsely strigillose; blade usually linear- to narrowly-elliptic, occasionally ovate to obovate, 14–42 × 3–10 mm, progressively narrower distally, base attenuate, margins entire, apex usually acute, rarely obtuse, surfaces glabrous or sparsely strigillose; venation inconspicuous. Cyathia solitary at distal bifurcations of stems; peduncle 0.6–2.4 mm, glabrous or strigillose. Involucre campanulate, 1–1.1 × 1.2–1.4 mm, strigillose at least toward apex; glands 5, green-yellow, oblong, 0.4–0.6 × 0.7–1 mm; appendages whitish to yellow-green, lunate to broadly ovate, 0.2–0.5 × 0.7–1.1 mm, entire or slightly crenulate. Staminate flowers 25–30. Pistillate flowers: ovary glabrous; styles 0.7–1 mm, 2-fid at apex. Capsules oblate to subglobose, 2.9–3.2 × 3.2–3.4 mm, glabrous; columella 2.8–3.1 mm. Seeds light gray to whitish, oblong-ovoid, rounded in cross section, 2.3–2.6 × 1.3–1.5 mm, dimpled and rugulose; caruncle absent.


Phenology: Flowering and fruiting spring–summer.
Habitat: Saltbush, blackbrush, Ephedra-dominated scrub and desert communities.
Elevation: 1100–1500 m.

Discussion

Euphorbia nephradenia is the only species of the genus endemic to the Colorado Plateau of Utah and adjacent Colorado.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia nephradenia"
Jess A. Peirson +, Victor W. Steinmann +  and Jeffery J. Morawetz +
Barneby +
Alectoroctonum +
Paria or Utah spurge +
Colo. +  and Utah. +
1100–1500 m. +
Saltbush, blackbrush, Ephedra-dominated scrub and desert communities. +
Flowering and fruiting spring–summer. +
Leafl. W. Bot. +
Endemic +  and Conservation concern +
Agaloma +  and Tithymalopsis +
Euphorbia nephradenia +
Euphorbia sect. Alectoroctonum +
species +