Quercus mohriana
in Rydberg, Bull. New York Bot. Gard. 2: 219. 1901.
Shrubs or trees, evergreen or deciduous, shrubs erect, rhizomatous, trees small, 0.5-3 m. Bark pale, rough and deeply furrowed. Twigs yellowish or whitish, 1-2 mm diam., felty-tomentose. Buds dark redbrown, round-ovoid, 2 mm, glabrous, occasionally puberulent on outer scales, not subtended by persistent, hairy, subulate stipules. Leaves: petiole 2-5 mm. Leaf-blade usually strongly bicolored, oblong or elliptic, (15-) 30-50 (-80) × (10-) 20-30 (-35) mm, leathery, base rounded, rarely cuneate or cordulate, margins entire or toothed or denticulate, undulate or flat, secondary-veins 8-9 on each side, apex rounded or acute; surfaces abaxially densely gray or white-tomentose with semierect curly, stellate hairs, secondary-veins rather prominently raised, adaxially dark or dull green, lustrous or somewhat glaucous, with minute, scattered, semierect or appressed-stellate, (4-) 6 or many rayed hairs, not felty to touch, secondary-veins slightly raised or prominent within depressions. Acorns solitary or paired, subsessile or peduncle sometimes 10-15 mm, tomentose like twigs; cup shallowly to very deeply cupshaped, 5-12 mm deep × 8-18 mm wide, enclosing 1/2 nut, base rounded or flat, margin thin, scales triangular-ovate to oblong, proximal scales coarsely tuberculate and canescent-tomentose, distal ones usually elongate and narrowed, tips appressed, reddish, thin, nearly glabrous; nut light-brown, ellipsoid to ovoid, 8-15 × 5-12 mm. Cotyledons connate.
Phenology: Flowering spring.
Habitat: Limestone hills and slopes, calcareous substrates
Elevation: 600-2500 m
Distribution
N.Mex., Okla., Tex., Mexico (Coahuila)
Discussion
Putative hybrids between Quercus mohriana Buckley and Q. grisea Liebmann are problematic and highly polymorphic. They are restricted to zones of contact between limestone, the preferred habitat of Q. mohriana, and igneous substrates, the preferred habitat of Q. grisea, or sometimes on dolomite, in western Texas.
Selected References
None.
Lower Taxa
"thin" is not a number.