Illustrated
Synonyms: Chamaesyce polycarpa var. hirtella (Boissier) Millspaugh Euphorbia polycarpa var. hirtella Boissier
Treatment appears in FNA Volume 12. Treatment on page 284.

Herbs, annual or perennial, with slender taproot to thickened rootstock. Stems prostrate to reclining, usually mound- or mat-forming, 7–25 cm, glabrous, puberulent, shortly pilose or hirsute. Leaves opposite; stipules usually distinct, occasionally connate basally on lower side of stem, subulate, 0.3–0.6 mm, shortly pilose or hirsute; petiole 0.4–0.9 mm, glabrous, puberulent, shortly pilose, or hirsute; blade ovate, elliptic, or oblong, 1.5–5 × 1–3 mm, base asymmetric, rounded to slightly oblique, margins entire, apex obtuse or acute, surfaces glabrous, puberulent, shortly pilose, or hirsute; venation obscure, only midvein sometimes conspicuous. Cyathia solitary at distal nodes, sometimes appearing clustered when distal nodes congested; peduncles 0–1.6 mm. Involucre campanulate, 0.6–1.1 × 0.5–1.3 mm, glabrous, shortly pilose, or hirsute; glands 4, dark pink to black-purple, oblong, 0.1–0.3 × 0.2–0.5 mm; appendages white to pink, usually ovate or flabellate, sometimes forming narrow rim around distal margin of gland, 0.1–0.2 × 0.3–0.8 mm, distal margin entire or shallowly lobed. Staminate flowers 15–30. Pistillate flowers: ovary glabrous, puberulent, or shortly pilose; styles 0.2–0.4 mm, 2-fid 1/2 length. Capsules ovoid to subglobose, 1.1–1.4 mm diam., glabrous, puberulent or shortly pilose; columella 0.9–1.2 mm. Seeds pink-brown to light brown, narrowly oblong-ovoid, (3–)4-angled in cross section, 0.8–1.1 × 0.5–0.6 mm, smooth or faintly rippled.


Phenology: Flowering and fruiting year-round in response to sufficient moisture.
Habitat: Desert scrub, chaparral, coastal sage scrub, disturbed areas, especially roadsides.
Elevation: -20–1200 m.

Distribution

V12 307-distribution-map.jpg

Ariz., Calif., Nev., Mexico (Baja California, Baja California Sur, Sonora).

Discussion

Selected References

None.

Lower Taxa

None.

Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Bentham +
Anisophyllum +
Ariz. +, Calif. +, Nev. +, Mexico (Baja California +, Baja California Sur +  and Sonora). +
-20–1200 m. +
Desert scrub, chaparral, coastal sage scrub, disturbed areas, especially roadsides. +
Flowering and fruiting year-round in response to sufficient moisture. +
Bot. Voy. Sulphur, +
Illustrated +
Chamaesyce polycarpa var. hirtella +  and Euphorbia polycarpa var. hirtella +
Euphorbia polycarpa var. polycarpa +
Euphorbia polycarpa +
variety +