Quercus chihuahuensis

Trelease

Mem. Natl. Acad. Sci. 20: 85. 1924.

Common names: Chihuahua oak felt oak
Illustrated
Synonyms: Quercus infralutea Trelease Quercus jaliscensis Trelease Quercus santaclarensis C. H. Muller
Treatment appears in FNA Volume 3.

Shrubs or trees, deciduous, to 10 m. Bark gray, furrowed, checkered, or scaly. Twigs gray, 2-3(-4) mm diam., densely tomentose. Buds reddish brown, broadly ovoid, distally rounded, 2-2.5 mm, densely yellowish pubescent; scales gray-puberulent; stipules persistent, 1-4, subulate, pubescent, at base of terminal buds. Leaves: petiole 3-5(-8) mm. Leaf blade elliptic or oblong to ovate or obovate, (25-)40-50(-85) × (18-)20-30(-50) mm, base rounded or shallowly cordate, margins entire or toothed to sublobate, secondary veins 8 to 10 on each side, somewhat branching, apex broadly rounded to acute; surfaces abaxially yellowish or grayish, densely stellate with velvety hairs, adaxially green, sparsely soft-pubescent with prominent, spreading, stellate hairs, felty to touch, secondary veins somewhat prominent on both surfaces, even under dense tomentum. Acorns 1-3 on tomentose peduncle 15-35(-60) mm; cup hemispheric, 7-10 mm deep × 10-15 mm wide, enclosing 1/2 nut, scales proximally thickened, distally appressed, densely gray-puberulent, tips reddish, ultimately glabrate; nut ovoid, 14-18 × 10-12 mm, puberulent, eventually glabrate. Cotyledons connate.


Phenology: Flowering spring.
Habitat: Oak and pinyon-juniper woodlands, grassy hills, sometimes extending into dry thorn scrub and bursera woodland (Mexico)
Elevation: 400-2000 m

Distribution

V3 607-distribution-map.gif

Tex., Mexico (Chihuahua, Sonora, Zacatecas, and San Luis Potosí).

Discussion

Quercus chihuahuensis is a distinctive species throughout its range, mostly in dry montane western Mexico; it occurs in the United States only as putative hybrids with Q. grisea (the Eagle and Quitman mountains) and Q. arizonica (Hueco Tanks) in Texas.

Selected References

None.

Lower Taxa

None.
... more about "Quercus chihuahuensis"
Kevin C. Nixon +  and Cornelius H. Muller +
Trelease +
Chihuahua oak +  and felt oak +
Tex. +, Mexico (Chihuahua +, Sonora +, Zacatecas +  and and San Luis Potosí). +
400-2000 m +
Oak and pinyon-juniper woodlands, grassy hills, sometimes extending into dry thorn scrub and bursera woodland (Mexico) +
Flowering spring. +
Mem. Natl. Acad. Sci. +
Illustrated +
Quercus infralutea +, Quercus jaliscensis +  and Quercus santaclarensis +
Quercus chihuahuensis +
Quercus sect. Quercus +
species +