12.
Ephedra viridis
Coville, Contr. U.S. Natl. Herb. 4: 220. 1893.
Green ephedra
Ephedra nevadensis
S. Watson subvar.
pluribracteata
Palmer ex Stapf;
E
.
nevadensis
var.
viridis
(Coville) M. E. Jones
Shrubs erect, 0.5--1 m. Bark gray, cracked and irregularly fissured. Branches alternate or whorled, rigid, angle of divergence about 30°. Twigs bright green to yellow-green, becoming yellow with age, not viscid, ridges between longitudinal grooves barely papillate, smooth; internodes 1--5 cm. Terminal buds conic, 1--2 mm, apex obtuse. Leaves opposite, 2--5 mm, connate to 1/2--3/4 their length, not photosynthetic; bases thickened, brown, persistent, becoming hard, enlarged, and black; apex setaceous. Pollen cones 2--several at node, obovoid, 5--7 mm, sessile; bracts opposite, 6--10 pairs, light yellow and slightly reddened, ovate, 2--4 × 2--3 mm, membranous, slightly connate at base; bracteoles slightly exceeding bracts; sporangiophores 2--4 mm, 1/4--1/2 exserted, with 5--8 sessile to nearly sessile microsporangia. Seed cones 2--several at node, obovoid, 6--10 mm, sessile or on short, scaly peduncles; bracts opposite, 4--8 pairs, ovate, 4--7 × 2--4 mm, membranous or papery, with yellow center and base, margins entire. Seeds 2, ellipsoid, 5--8 × 2--4 mm, light brown to brown, smooth. 2 n = 28.
Coning spring. Dry rocky slopes and canyon walls; 800--2500 m; Ariz., Calif., Colo., Nev., N.Mex., Oreg., Utah, Wyo.
