Oaks of the World

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  Quercus havardii
Author Rydb. 1901 Bull. New York Bot. Gard. 2: 213
Local names Havard’s oak ; sand shinnery oak ; Havard ‘s shinnery oak ; shin oak ;
Range Southeastern New-Mexico; northwestern Texas; W. Oklahoma; 500-2000 m;
Growth habit 0,5-2 m; often forming a spreading bush (to 15 m wide), multiple trunks (to 60 or more) by layering in the sandy soil;
Leaves 2.5-7.5 x 1.2-5.5 cm ; elliptic to lanceolate; leathery; apex pointed sometimes truncate; base rounded to cuneate; margin entire or coarsely dentate, often wavy; adaxially slightly hairy, dull green; abaxially densely hairy, with 8-13 rayed stellate hairs; 5-8 vein pairs; petiole pubescent to 7 mm;
Flowers in April; 8 stamens;
Fruits large acorn 1.5-2.5 cm long; singly or paired; subsessile, or shortly stalked; enclosed 1/3-1/2 by cup; cup deep, densely tomentose inside, with warty scales basally thick; maturing in 1 year; edible;

Bark, twigs and

bark pale grey, slightly furrowed; young shoots tomentose, becoming glabrous in 2 years, sometimes red brown; bud dark brown, subglobose, slightly pubescent, 2 mm long;
Hardiness zone, habitat hardy in zone 7; occurs in sand dunes;
Miscellaneous -- A. Camus n° 259;
-- Sub-genus Quercus, Section Quercus, Series Stellatae;
-- Threatened (IUCN Red List Category : EN)
-- Hybridizes with
Q.pungens which it resembles a lot, and with Q.stellata;

Subspecies and
--- var. tuckeri S.L Welsh 1986
it is probably a hybrid with Q.gambelii and Q.turbinella; it is used to stablize sand dunes;