The Gymnosperm Database


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Conservation status

Ephedra pedunculata

Engelmann ex Watson 1883

Common names

Clap-weed (Stevenson 1993).

Taxonomic notes


"Shrubs vinelike, trailing or clambering, 6-7 m. Bark gray, slightly cracked and fissured. Branches alternate (rarely whorled), lax, angle of divergence about 55°. Twigs gray-green, becoming green, then yellow-green with age, glaucous, with several moderately deep longitudinal grooves; internodes 1-8 cm. Terminal buds attenuate, 1-3 mm. Leaves opposite, 1-3 mm, connate to 2/3-7/8 their length; bases splitting at margins, persistent; apex obtuse. Pollen cones 1-2 at node, lanceoloid, 4-8 mm, sessile or on short to long, smooth peduncles; bracts opposite, 6-12 pairs, light yellow to reddish, obovate, 2-4 × 2-3 mm, membranous, free or slightly connate at base; bracteoles barely exceeding bracts; sporangiophores 3-5 mm, exserted to 1/2 their length, with 4-6 long-stalked (1-2 mm) microsporangia. Seed cones 1-2 at node, ovoid, 6-10 mm, on short to long, smooth peduncles; bracts opposite, 3-6 pairs, 3-4 × 2-3 mm, ovate, connate to 1/8-7/8 their length, inner pairs becoming succulent and red when ripe. Seeds 2, ellipsoid, 4-10 × 2-4 mm, brown, smooth. ... Coning midwinter-early spring" (Stevenson 1993).

Distribution and Ecology

US: Texas & N Mexico; at 100-1000 m on dry, sandy to rocky areas and slopes (Stevenson 1993).

Big tree





"[O]f conservation concern" (Stevenson 1993).


See also

Last Modified 2017-12-29