Ephedra nevadensis

S. Watson

Proc. Amer. Acad. Arts 14: 298. 1879.

Common names: Nevada ephedra
Endemic
Basionym: Ephedra antisyphilitica S. Watson 1871,
Synonyms: Ephedra antisyphilitica var. pedunculata S. Watson Ephedra nevadensis var. paucibracteata Stapf
Treatment appears in FNA Volume 2.

Shrubs erect, 0.25–1.5 m. Bark gray, fissured. Branches alternate or whorled, rigid, angle of divergence about 45°. Twigs pale green, becoming yellow with age, not viscid, glaucous, with numerous longitudinal grooves; internodes 1–6 cm. Terminal buds conic, 1–3 mm, apex obtuse. Leaves opposite (rarely in whorls of 3), 2–4 (–8) mm, connate to 1/2–3/4 their length; bases thickened, brown, completely deciduous; apex obtuse. Pollen cones 1–several at node, ellipsoid, 4–8 mm, sessile or on short peduncles with 2 pairs of basal bracts; bracts opposite, 5–9 pairs, yellow to light-brown, obovate, 3–4 × 2–3 mm, membranous; bracteoles slightly exceeding bracts; sporangiophores 3–5 mm, exserted to 1/4–1/2 their length, with 6–9 sessile to short-stalked (less than 1 mm) microsporangia. Seed-cones 1–several at node, nearly globose, 5–11 mm, on long peduncles, with 1–2 pairs of basal bracts; bracts opposite, 3–5 pairs, nearly circular, 4–8 × 3–6 mm, herbaceous, with light-brown to yellow-green center, occasionally pinkish tinged, margins entire. Seeds (1–) 2, ellipsoid, 6–9 × 2–4 mm, brown, smooth. 2n = 14, 28.


Phenology: Coning late winter–midspring.
Habitat: Dry, rocky slopes and hills, rarely in sandy flat areas
Elevation: 700–1900 m

Distribution

V2 338-distribution-map.gif

Ariz., Calif., Nev., Oreg., Utah.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Ephedra nevadensis"
Dennis Wm. Stevenson +
S. Watson +
fissured +
deciduous +
Ephedra antisyphilitica +
pinkish tinged +, yellow +  and light-brown +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
obovate +
membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
whorled +  and alternate +
yellowish green;olive-green +
light-brown +  and yellow-green +
Nevada ephedra +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
on short to long peduncle +, sessile +  and compound +
subtending +
Ariz. +, Calif. +, Nev. +, Oreg. +  and Utah. +
700–1900 m +
Dry, rocky slopes and hills, rarely in sandy flat areas +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
ephemeral +
connate +
0;1/2-3/4 +
photosynthetic +
scale-like +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
bilocular +, sessile +  and long-stalked +
single-integumented +
1 (?) +  and 2 (?) +
Coning late winter–midspring. +
on short peduncles +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
whorled +, opposite +  and overlapping +
fleshy +, papery +  and membranous +
Proc. Amer. Acad. Arts +
ellipsoid;ovoid obovoid or nearly globose +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
smooth to scabrous +
ellipsoid +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Ephedra antisyphilitica var. pedunculata +  and Ephedra nevadensis var. paucibracteata +
Ephedra nevadensis +
species +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not viscid +
yellow +  and pale green +