Euphorbia macropus

(Klotzsch & Garcke) Boissier

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 52. 1862.

Common names: Huachuca mountain spurge
Basionym: Anisophyllum macropus Klotzsch & Garcke Abh. Königl. Akad. Wiss. Berlin 1859: 33. 1860
Synonyms: Euphorbia biformis S. Watson E. plummerae S. Watson
Treatment appears in FNA Volume 12. Treatment on page 248. Mentioned on page 241.

Herbs, perennial, with thick, globose to elongated tubers, 2–8 cm. Stems erect to ascending, branched, 10–45(–60) cm, glabrous, puberulent, or densely hirsute to setose, often with 2-layered indumentum of long hairs intermixed with short hairs. Leaves usually opposite, occasionally whorled distally, or rarely with 1–2 alternate leaves; stipules 0.1–0.2 mm; petiole 0–18 mm, hirsute, sericeous, or strigose; blade linear to ovate or almost orbiculate, 6–54 × 2–19 mm, base rounded to attenuate, margins entire, occasionally ciliate with stiff recurved hairs, apex acute to obtuse, surfaces usually hirsute, sericeous, or strigose, occasionally glabrous adaxially; venation conspicuous. Cyathia in weakly-defined terminal dichasia; peduncle 1.4–5.8 mm, glabrous. Involucre obconic to campanulate, 1.1–1.4 × 0.5–1.5 mm, glabrous or strigillose; glands 4–5, greenish, oblong, 0.2 × 0.4–0.5 mm; appendages usually yellowish or green, rarely dark purple, ovate, flabellate, semiorbiculate, or oblong, 0.3–0.9 × 0.4–1.1 mm, usually entire. Staminate flowers 10–15. Pistillate flowers: ovary glabrous, sericeous, or strigillose; styles 0.4–0.6 mm, 2-fid 1/2 length. Capsules oblate, 2.3–3 × 3.1–4.2 mm, glabrous, sericeous, or strigillose; columella 1.6–2.1 mm. Seeds black to light brown, broadly ovoid to subglobose, rounded in cross section, 1.5–2.3 × 1.4–1.8 mm, smooth or with low rounded tubercles; caruncle absent.


Phenology: Flowering and fruiting summer–fall.
Habitat: Stream banks and rocky slopes in pine-oak woodlands, sometimes with juniper, Douglas fir-pine forests.
Elevation: 1500–2200m.

Distribution

Loading map...
Created with Raphaël 2.2.0
V12 741-distribution-map.jpg

Ariz., Mexico, Central America (Guatemala, Honduras).

Discussion

Euphorbia macropus is a widespread and common Mexican species just barely entering the flora area in southeastern Arizona, where most of the collections are from the Huachuca Mountains.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia macropus"
Jess A. Peirson +, Victor W. Steinmann +  and Jeffery J. Morawetz +
- Klotzsch & Garcke Boissier +
Anisophyllum macropus +
Huachuca mountain spurge +
Ariz. +, Mexico +, Central America - Guatemala +  and Honduras. +
1500–2200m. +
Stream banks and rocky slopes in pine-oak woodlands, sometimes with juniper, Douglas fir-pine forests. +
Flowering and fruiting summer–fall. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Euphorbia biformis +  and E. plummerae +
Euphorbia macropus +
Euphorbia sect. Alectoroctonum +
species +