Quercus grisea

Liebmann

Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider 1854: 171. 1854.

Common names: Gray oak
Illustrated
Basionym: Quercus undulata var. grisea (Liebmann) Engelmann Trans. St. Louis Acad. 3: 393. 1877
Treatment appears in FNA Volume 3.

Large shrubs or moderate trees, deciduous or subevergreen, to 10 m. Bark gray, fissured. Twigs gray, 1-2 mm diam., sparsely or densely stellate-tomentulose or tomentose when young. Buds dark redbrown, ovoid to subglobose, 1-2 mm, stellate hairs causing yellowish color, at least on outer scales; stipules persistent, 1-4, subulate, pubescent, at base of terminal buds. Leaves: petiole 3-10 mm. Leaf-blade oblong to elliptic or ovate, (15-) 25-35 (-80) × (7-) 15-30 (-40) mm, thick and leathery, base cordate or rounded, margins minutely revolute, entire or dentate with mucronate teeth, secondary-veins 6-10 on each side, branched, apex acute, sometimes obtuse, rarely rounded; surfaces abaxially dull gray-green or yellowish, minutely stellate-pubescent with interlocking hairs, secondary-veins very prominent, adaxially dull green, very sparsely and minutely stellate-pubescent, secondary-veins slightly raised. Acorns solitary or paired, subsessile or on peduncle 0-30 mm; cup from deeply goblet to deeply cupshaped, 4-10 mm deep × 8-15 mm wide, enclosing to 1/2 nut, scales broadly ovate to oblong, proximal scales slightly or markedly tuberculate and whitish canescent, tips closely appressed, redbrown, thin, glabrate; nut light-brown, ovoid to narrowly ovoid or ellipsoid, 12-18 × 8-12 mm. Cotyledons connate.


Phenology: Flowering spring.
Habitat: Igneous or dolomitic slopes, oak woodlands, juniper woodlands, desert chaparral
Elevation: usually above 1500 m

Distribution

V3 1146-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Sonora), Mexico (Chihuahua), Mexico (and Durango)

Discussion

Some of the specimens referred to Quercus endemica by C. H. Muller should be placed in Q. grisea.

Numerous hybrids between Quercus grisea and other white oaks, including Q. gambelii, Q. mohriana, Q. arizonica, and numerous species in northern Mexico, have been reported. In the Hueco and Quitman mountains of trans-Pecos Texas, putative hybrids of Q. grisea × Q. turbinella Greene occur.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Quercus grisea"
on peduncle +  and subsessile +
paired +  and solitary +
rounded +, obtuse +  and acute +
Kevin C. Nixon +
Liebmann +
fissured +
rounded;cordate +
Quercus undulata var. grisea +
dark redbrown +
ovoid +  and subglobose +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
2-6-lobed +
pistillate +, capitate +  and spicate +
Gray oak +
starchy +  and fleshy +
cup-shaped +
×8-15 +, 4mm +  and 10mm +
multibracteate +, spiny +  and scaly +
Ariz. +, N.Mex. +, Tex. +, Mexico (Sonora) +, Mexico (Chihuahua) +  and Mexico (and Durango) +
usually above 1500 m +
pistillate +  and staminate +
biennial +, annual +  and maturation +
1-seeded +  and winged +
in groups +  and enclosed +
Igneous or dolomitic slopes, oak woodlands, juniper woodlands, desert chaparral +
yellowish color +
pistillate +, spicate +  and staminate +
tomentulose +  and glabrate +
3.5 cm35 mm <br />0.035 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
oblong +  and elliptic or ovate +
thick;15mm;30mm +
arranged +  and alternate +
dentate +  and entire +
toothed +  and entire +
light-brown +
1.2 cm12 mm <br />0.012 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
ovoid +  and narrowly ovoid or ellipsoid +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering spring. +
Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider +
connate +  and distinct +
few-to-many +
broadly ovate +  and oblong +
reduced +
raised +  and prominent +
stellate-pubescent +
Illustrated +
inconspicuous +
distinct +
subulate +  and dilated +
enlarged +
yellowish +, gray-green +  and dull +
stellate-pubescent +
Quercus grisea +
Quercus sect. Quercus +
species +
spheric +  and ovoid terete or angled +
bristle-tipped +
mucronate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
tomentose +  and stellate-tomentulose +
subevergreen +  and deciduous +
tree +  and shrub +
moderate +  and large +