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.
Revision as of 23:26, 29 July 2020 by imported>Volume Importer
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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.

"/2-3/4" is not declared as a valid unit of measurement for this property.

... 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 +
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 +