Ephedra antisyphilitica

Berlandier ex C. A. Meyer

Sér. 6, Sci. Math., Seconde Pt. Sci. Nat. 5(2): 29. 1846.

Common names: Clap-weed popote tepopote
Synonyms: Ephedra antisyphilitica var. brachycarpa Cory Ephedra occidentalis E. L. Reed Ephedra texana
Treatment appears in FNA Volume 2.

Shrubs erect or spreading, 0.25–1 m. Bark gray, slightly cracked and irregularly fissured. Branches alternate or whorled, rigid, angle of divergence about 45°. Twigs green, becoming yellow-green with age, glaucous, not viscid, with numerous longitudinal grooves; internodes 2–5 cm. Terminal buds conic, 1–3 mm, apex obtuse. Leaves opposite, 1–3 mm, connate to 2/3–7/8 their length; bases thickened, brown, completely deciduous; apex obtuse. Pollen cones 1–2 at node, lance-ellipsoid, 5–8 mm, sessile to nearly sessile; bracts opposite, 5–8 pairs, pale green to red, obovate, 2–4 × 2–3 mm, membranous, connate at base; bracteoles slightly exceeding bracts; sporangiophores 4–5 mm, 1/2 exserted, with 4–6 sessile to very short-stalked (less than 1 mm) microsporangia. Seed cones 1–2 at node, ellipsoid, 6–12 mm, sessile to nearly sessile; bracts opposite, 4–6 pairs, ovate, 5–7 × 5–10 mm, connate to 1/8–7/8 their length, inner pairs becoming fleshy and red. Seeds 1(–2), ellipsoid, 6–9 × 2–4 mm, light brown to chestnut, smooth.

Phenology: Coning March–April.
Habitat: Arid soils and rocky slopes
Elevation: 100–1200 m


V2 551-distribution-map.gif

Okla., Tex., Mexico in Nuevo León and San Luis Potosí.


Mexican populations of Ephedra antisyphilitica are disjunct from those in Texas.

Selected References


Lower Taxa

... more about "Ephedra antisyphilitica"
Dennis Wm. Stevenson +
Berlandier ex C. A. Meyer +
Clap-weed +, popote +  and tepopote +
Okla. +, Tex. +  and Mexico in Nuevo León and San Luis Potosí. +
100–1200 m +
Arid soils and rocky slopes +
Coning March–April. +
Ephedra antisyphilitica var. brachycarpa +, Ephedra occidentalis +  and Ephedra texana +
Ephedra antisyphilitica +
species +