Quercus viminea

Trelease

Mem. Natl. Acad. Sci. 20: 123, plate 222. 1924.

Illustrated
Treatment appears in FNA Volume 3.

Trees, evergreen or drought-deciduous, to 10 m. Twigs brown to dark reddish-brown, 2-3 mm diam., sparsely to uniformly pubescent. Terminal buds brown to reddish-brown, acutely ovoid, 1.5-2.5 mm, glabrous. Leaves: petiole 2-5 mm, pubescent. Leaf-blade narrowly lanceolate, widest at or proximal to middle, 35-60 [-150] × 7-10 mm, base usually rounded or obtuse, often oblique, occasionally somewhat cordate, margins entire with 1 apical awn, apex acute to acuminate; surfaces abaxially glabrous or with prominent tufts of tomentum near base of blade, adaxially glabrous or with pubescence along midrib and scattered on blade. Acorns (not known within our range) biennial; cup cupshaped, 5-8 mm high × 8-10 mm wide, covering ca. 1/3 nut, inner surface pubescent, scales with appressed, obtuse tips; nut ovoid, 9-15 × 7-10 mm.


Phenology: Flowering spring or summer.
Habitat: Habitat not specified
Elevation: 1500 m

Distribution

V3 911-distribution-map.gif

Ariz., Mexico (Chihuahua), Mexico (Sonora), Mexico (and southward)

Discussion

As with many of the Madrean counterparts of the oak flora, in very dry years trees progressively lose their leaves through the long dry spring and may become virtually leafless by the time the rains come in early summer (R. W. Spellenberg, pers. comm.).

In the flora, Quercus viminea is known from a single sterile specimen collected at Red Mountain, Santa Cruz County, Arizona. Recent attempts to find the taxon at this site have been fruitless. The Arizona specimen is similar to specimens from northern Mexico that have small, usually entire, narrowly lanceolate leaves with short petioles. These northern forms appear to grade clinally into larger-leaved southern forms that fit the general description of Q. bolanyosensis Trelease.

Selected References

None.

Lower Taxa

None.
... more about "Quercus viminea"
acute +  and acuminate +
Kevin C. Nixon +
Trelease +
furrowed +  and smooth +
gray;dark-brown or black +
cordate;obtuse;rounded +
2-6-lobed +
pistillate +, capitate +  and spicate +
connate +  and distinct +
starchy +  and fleshy +
tuberculate +
cup-shaped +
×8-10 +, 5mm +  and 8mm +
multibracteate +, spiny +  and scaly +
Ariz. +, Mexico (Chihuahua) +, Mexico (Sonora) +  and Mexico (and southward) +
1500 m +
pistillate +  and staminate +
biennial +, annual +  and maturation +
1-seeded +  and winged +
in groups +  and enclosed +
Habitat not specified +
pistillate +, spicate +  and staminate +
silky-tomentose +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (6 cm60 mm <br />0.06 m <br />) +
proximal +  and middle +
arranged +  and alternate +
toothed +  and entire +
0.9 cm9 mm <br />0.009 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering spring or summer. +
Mem. Natl. Acad. Sci. +
distinct +
few-to-many +
reduced +
anastomosing +, branching +  and unbranched +
Illustrated +
inconspicuous +
distinct +
linear-spatulate +
with pubescence +, glabrous +  and with prominent tufts +
Quercus viminea +
Quercus sect. Lobatae +
species +
brown +  and reddish-brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
obtuse +
bristle-tipped +
brown +  and dark reddish-brown +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
drought-deciduous +  and evergreen +