Oaks of the World

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  Quercus muehlenbergii
Author Engelm. 1887 Trans. Acad. Sci. St. Louis 3: 391
Synonyms acuminata (Michx.) Sarg. 1895
alexanderi Britt.
brayi Small 1901
castanea Muhl. 1801, nom. illeg., not Née
muehlenbergii var. brayi (Small) Fang 1918
prinoides var. acuminata (Michx.) Gleason 1952
prinoides var. alexanderi (Britt.) Steyerm. 1960
prinus Coulter
prinus L. var. acuminata Michx.1801
rubra var. muehlenbergii (Engelm.) Wenz. 1884
Local names chinkapin ; yellow chestnut oak ; chinquapin oak ; yellow oak ;
Range Eastern and Central USA; Canada; NE Mexico (Coahuila, Nuevo Leon, Tamaulipas); 0 to 2300 m; introduced in Europe in 1822;
Growth habit reaches 15-30 m tall; crown narrow, tip rounded; shrubby in the northern part of its area;
Leaves 6-12 x 3-9 cm; deciduous; thin but leathery; oboval to oblanceolate; apex acute or acuminate; base cuneate or truncate; margin slightly revolute with 4-11 pairs of shallow lobes, pointed but not spinny; shiny green, glabrescent above; whitish green, hairy beneath (scattered stellate hairs and some glandular ones), then glaucous and greyish when drying; 7-12 pairs of lateral veins, parallel, straight, slightly impressed above, raised beneath; epidermis papillose; petiole yellow, hairless or nearly so, 1-2 cm long;
Flowers late winter, early spring; male inflorescence 4-6 cm; female inflorescence 0.5-2 cm bearing 1-3 flowers;
Fruits acorn 2 cm long, ovoid; dark brown to black; stalkless or nearly so; singly or paired; enclosed 1/2 or 1/3 by the grey tomentose cup; maturing in 1 year in September; cotyledons distinct;

Bark, twigs and

bark light grey, scaly, thin; twig 1-4 mm thick, reddish, slightly pubescent, becoming hairless and grey, with conspicuous whitish lenticels; buds brown, ovoid to globose, 2-3 mm; stipules 3-4 mm long, more or less glabrous;
Hardiness zone, habitat hardy; all types of soils, including calcareous ones; prefers dry soils;
Miscellaneous -- A. Camus : n° 192 ;
-- Sub-genus Quercus, Section Quercus, Subsection Prinoideae;
-- Henry E. Muehlenberg (1753-1815) was a botanist from Pennsylvania;

Subspecies and

-- Q.sentenelensis C.H.Muller 1937
= closely related (if not identical ?), in moist canyons; more than 3 m tall; Mexico (Coahuila); for S. Valencia-A. (2004) it is a synonym of muehlenbergii.

-- It is not easy to separate the shrubby forms of Q.muehlenbergii from Q.prinoides, but the latter bears acorns even on young plants, and layers all around;