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 red-brown, 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 cup-shaped, 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, red-brown, 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, Chihuahua, 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.

... more about "Quercus grisea"
Kevin C. Nixon +
Liebmann +
Quercus undulata var. grisea +
Gray oak +
Ariz. +, N.Mex. +, Tex. +, Mexico (Sonora +, Chihuahua +  and and Durango). +
usually above 1500 m +
Igneous or dolomitic slopes, oak woodlands, juniper woodlands, desert chaparral +
Flowering spring. +
Overs. Kongel. Danske Vidensk. Selsk. Forh. Medlemmers Arbeider +
Illustrated +
Quercus grisea +
Quercus sect. Quercus +
species +