Oaks of the World

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 Quercus longinux
AuthorHayata 1911
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 nameschang guo qing gang ;
Range Taiwan, 300 to 2500 m;
Growth habittree to 15 m tall, trunk to 0.6 m in diameter;
Leaves 6-8 x 2-2.5 cm; narrowly oblong-elliptic to oval-lanceolate; leathery; apex caudate to long acuminate; base cuneate; margin serrate in apical half; shiny green adaxially; glaucous chalky beneath; 7-9 vein pairs, prominent below; petiole hairless 1-2 cm;
FlowersMarch 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;

Bark, twigs and
buds

twigs slender, blackish brown, glabrous, with oblong lenticels; bud ovoid, brown, with scales remotely hairy;
Hardiness zone, habitatnot hardy; thrives in evergreen broadleaves forests;
Miscellaneous -- Sub-genus Cyclobalanopsis;
-- related to
Q.myrsinifolia, but acorn thinner and leaves narrower;
Subspecies and
varieties
var. lativiolaciifolia Liao (in Flora of Taiwan).
Pictures

drawing