Oaks of the World

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  Quercus augustinii
Author Skan 1899 J. Linn. Soc., Bot. 25: 507 1899.
Synonyms Cyclobalanopsis augustinii (Skan) Schottky 1912
augustinii var. angustifolia A.Camus 1933
augustinii var. rockiana A.Camus 1935
augustinii var. genuina A.Camus 1935 nom. inval.
glabricupula Barnett 1938
Pasania chiwui Hu
Local names zhai ye qing gang ;
Range China (Yunnan, Guizhou, Guangxi) ; Vietnam ; Northeast Myanmar; Thailand ; from 1200 m to 2700 m;
Growth habit 1.5-3 m, but reaches sometimes 10 m;
Leaves 7-12 cm long, 1-4 cm wide; evergreen; oval-lanceolate to elliptic-lanceolate; apex acuminate, base cuneate and oblique; margin mostly entire, or more or less slightly toothed near apex; glabrous, shiny above; somewhat farinose or glaucescent, glaucous below; midrib not impressed above; 10-15 pairs of secondary veins; petiole glabrous, 0.5-2 cm long;
Flowers pistillate inflorescences solitary, 3-4 cm long, at axils of young shoots with 5-10 flowers ; flowers in April-May; 3 styles;
Fruits acorn oblong-ovoid, 1-1.7 cm long, 0.8-1.2 cm wide, glabrous, apically rounded and sometimes depressed; enclosed for 1/2 in cupule; cupule 0.6-1 cm long, 1-1.3 cm wide, outside glabrous or nearly so, sericeous inside, with 5-7 concentric rings entire or crenate; scar slightly convex; stylopodium persistent; maturing in 2 years;

Bark, twigs and

dark grey bark; twigs sulcate, orangish brown at first, becoming glabrous;
Hardiness zone, habitat not quite hardy; all types of soils; cultivated in Great Britain;
Miscellaneous -- A. Camus : tome 1, p. 230, n 23;
-- Sub-genus Cerris, section Cyclobalanopsis;
-- Section Cyclobalanoides (Menitsky).
-- Also written "augustini" ;

Subspecies and
-- Cyclobalanopsis augustinii var. negrinux (Hu) M.Deng & Z.K.Zhou 2005 comb. nov.
= Cyclobalanopsis nigrinux and Q. augustini are very close and differ only in having leaves thinner, brown and smooth beneath, neither farinose nor glaucescent in nigrinux, whereas augustini  has farinose or glaucescent leaf-undersides.
So C. nigrinux may be considered as a variety of Q. augustini; what's more, for The Plant List it is a synonym


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