| Quercus hypoxantha | |
| Author |
Trel. 1924 Mem. Natl. Acad. Sci. 20: 170 Diagnosis here |
| Synonyms | errans fo. gracilirarmis C.H.Muller 1936 |
| Local names | |
| Range | Mexico
(Coahuila, Nuevo Leon, San Luis Potosi, Tamaulipas); |
| Growth habit | usually
less than 3 m tall; |
| Leaves |
3-5 cm long, 1.5-2.5 wide;
semi-evergreen; leathery; oboval; often folded lengthwise; apex acute
or obtuse, aristate; base varying : usually cordate; margin thick, revolute,
wavy, with 1-4 pairs of sharp, bristle-tipped teeth in the apical half;
light green or grey green (sometimes darker) above, with minute, scattered
hairs of various types except glandular; abaxially with dense, woolly,
yellow-pinkish tomentum (made of fascicled hairs and golden uniseriate
glandular ones, both of them evenly and equally laid out), persistent
but easily scratchable, sometimes desappearing with age, covering all
the limb including the 6-8 vein pairs; midrib and lateral veins impressed
above; epidermis usually bullate ; petiole 0.5 cm long, reddish, glabrescent;
|
| Flowers | in
June; male inflorescence 5-6 cm long, with more than 20 flowers; |
| Fruits | acorn ovoid, 1-1.5 cm long; solitary, sessile or on a 2-3 mm long peduncle; cup half-round with rounded, flat, tomentose scales; cup enclosing 1/2 of nut; maturing in 2 years in September; cotyledons free; |
|
Bark, twigs and |
bark
smooth, dark grey; twig slender, thin (to 2.3 mm in diameter), persistently
yellowish pubescent, with inconspicuous lenticels; very small bud (2 mm
long), ovoid globose, glabrous, with ciliate scales; stipules 2 mm
long, seldom persistent; |
| Hardiness zone, habitat | probably hardy zone 7; |
| Miscellaneous | -- A.
Camus : n° 367; -- Sub-genus Quercus, section Lobatae, Series Erythromexicanae; -- Related to Q.hintoniorum (which differs in having the abaxially not glandular trichomes only at the vein axils, and cupules covering only 1/4 or 1/3 of the nut); it forms the "Quercus hypoxantha complex Nixon & Muller 1993", in association with mainly Q. hintoniorum, Q.coahuilensis and Q.miquihuanensis, and less often with Q. galeanensis, Q. saltillensis and |
| Subspecies and varieties |
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| Pictures |
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