| Quercus chihuahuensis | |
| Author | Trel. 1924 Mem. Natl. Acad.
Sci. 20: 85 1924 Diagnosis here |
| Synonyms | infralutea Trel. 1924 Diagnosis
here jaliscensis Trel. 1924 Diagnosis here santaclarensis C.H.Muller 1938 |
| Local names | Chihuahuan
oak ; felt oak ; encino miscalme ; |
| Range | Mexico
(Aguascalientes, Chihuahua, Durango, Guanajuato, Jalisco, Nayarit, Nuevo
Leon, Sinaloa, Sonora, Zacatecas, San Luis Potosi); 1400 - 2000 m; |
| Growth habit | 5-8
m; trunk to 0.3-0.4 m in diam.; spreading crown; |
| Leaves |
4-10 x 2-5 cm; late deciduous; leathery; oblong-oboval or elliptic; not convex; apex obtuse, sometimes subacute or mucronate; base rounded or subcordate; margin entire or sinuate-dentate (if so, with 1-4 pairs of teeth ending in a mucro), flat or slightly revolute, thick; yellowish blue-green, at first densely fascicled (3-8 rays) tomentose above, then glabrescent; paler below, densely whitish-yellow tomentose with stipitate fascicled hairs (stalk more than 0.08 mm long, to 0.2 mm); 8-10 vein pairs, both sides flat or sometimes slightly impressed adaxially; epidermis pale green or glaucous, papillose and glandular; petiole 3-10 mm, tomentose; |
| Flowers | spring;
|
| Fruits | acorn 1.5 cm, ovoid, light brown; solitary or paired; peduncle pubescent 1.5-5 cm; 1/2 enclosed by cup; cup with straight rim and densely tomentose scales; maturing first year from June to November; cotyledons connate; |
|
Bark, twigs and |
bark grey, sulcate, broken into square plates; twigs 2-3 mm wide, grey densely tomentose; buds brown, yellowish pubescent, 2-4 mm long; 1-4 deciduous stipules at base of terminal buds; |
| Hardiness zone, habitat |
hardy zone 7; all types of soils, but prefers dry ones; |
| Miscellaneous | --
A. Camus : n° 256 ; -- Sub-genus Quercus, Section Quercus; Series Leucomexicanae, Group Chihuahuenses; -- Rare in USA, where it forms hybrids with Q.grisea and Q.arizonica -- For Zavala-Chavez, 2003, Q.infralutea is a variety of Q.invaginata. -- Possible confusion with Q. grisea, which has whitish, stalkless, stellate trichomes; also with Q. deserticola which has midrib and secundary veins impressed above, stipitate and sessile fasciate hairs below (the stalk less than 0.07 mm long) and margins markedly revolute. -- Resembles also Q. praeco, which differs in having the rim of the cupule rolled inside, the underside covered with subsessile fascicled hairs, stipitate ones (stalk nearly 0,1 mm long)and stellate other ones. |
| Subspecies and varieties |
--
numerous formas described by Trelease; |
| Pictures |
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