Oaks of the World

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  Quercus longinux
Author Hayata 1911 J. Coll. Sci. Imp. Univ. Tokyo 30(1): 292
Synonyms Cyclobalanopsis longinux (Hayata) Schottky 1912
Cyclobalanopsis longinux var. kuoi Liao
Cyclobalanopsis longinux var. pseudomyrsinifolia (Hayata) Liao 1971
glauca var. longinux (Hayata) Menitsky 1977
kanehirai Nakai
longinux var. kuoi (Liao) C.F Shen 1984
longinux var. kanehirai (Nakai) Liao 1970
pseudomyrsinifolia Hayata 1911
taichuensis Hayata 1911
Local names chang guo qing gang ;
Range Taiwan, 300 to 2500 m;
Growth habit tree to 15 m tall, trunk to 0.6 m in diameter;
Leaves 6-8 x 2-2.5 cm; leathery; narrowly oblong to lanceolate; apex caudate to long acuminate; base cuneate; margin serrate in apical half; shiny green adaxially; glaucous chalky beneath, with simple hairs ; 7-9 vein pairs, prominent below; petiole hairless 1-2 cm;
Flowers March to May; male flowers with lobes of perianth hairy only on margin; female flowers with enlarged stigmas;
Fruits acorn ovoid to ovoid-ellipsoid, 1.2 cm long, 0.9 cm wide; cup thin, enclosing 1/3 of nut, 8-9 mm long, 10-12 mm wide, greyish brown tomentose outside, with 6-8 concentric rings denticulate at rim; scar convex; stylopodium persistent, short; maturing in 1 year from September to November;

Bark, twigs and

twigs slender, blackish brown, glabrous, with oblong lenticels; bud ovoid, brown, with scales remotely hairy;
Hardiness zone, habitat not quite hardy; thrives in evergreen broadleaves forests;
Miscellaneous -- Camus : tome 1, p. 268, n°40 (with Q. myrsinaefolia)
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Related to
Q.myrsinifolia, but acorn thinner and leaves narrower;

Subspecies and
var. lativiolaciifolia Liao (in Flora of Taiwan).