Oaks of the World

General dataClassificationsList of speciesLocal namesBack to
home page

 Quercus chevalieri
AuthorHickel & A.Camus 1921
Synonyms Cyclobalanopsis chevalieri (Hickel & A.Camus) Hsu & Wei Jen 1993
Cyclobalanopsis nigrinux Hu 1951
Local nameshei guo qing gang ;
RangeChina (Yunnan, Guangdong, Guangxi), Vietnam ; 600 - 2000 m ;
Growth habit10-15 m tall, but may reach 20 m;
Leaves 6-11 x 2-4 cm; evergreen ; subleathery; elliptic or oboval-oblong; base cuneate ; apex subotuse to sometimes shortly caudate; margin entire, wavy, sometimes some minute teeth near apex; hairless; concolor or nearly so; midrib impressed adaxially; 9-13 conspicuous  vein pairs, slightly impressed above, prominent below; conspicuous tertiary veins; petiole 5-10 mm;
FlowersApril-May
Fruits acorn ovoid-oblong, 1.5-1.8 cm long, 0.8-1.3 cm in diameter, 2 to 5 together, hairless or slightly silky, with basal scar convex; 1/2 enclosed by cup; cup 0.8-1.8 cm in diam., brown, silky both sides, thin, with 7-9) concentric rings of scales with margins weakly denticulate; ripe first year, between October and December;

Bark, twigs and
buds

twigs slender, sulcate, covered with whitish bloom when 2 years old; numerous lenticels;
Hardiness zone, habitatnot hardy;
Miscellaneous -- A. Camus : n 52 ;
-- Sub-genus Cyclobalanopsis;
-- Section Glauca, sub-section Glaucae (Menitsky);
-- Q. chevalieri and C. nigrinux are, for many Authors, synonyms;  actually  they are different.  The leaf of nigrinux is oval-lanceolate, with an acuminate apex, a margin slightly denticulate, whereas chevalieri has elliptic-oblong leaves, entire, with subobtuse apex; moreover, nigrinux has 6-10 thin  secondary veins pairs, inconspicuous, just as the tertiary veins, whereas chevalieri  has 9-13 vein pairs conspicuous (tertiary veins too).
    * On the other hand C. 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.
Subspecies and
varieties
--- Cyclobalanopsis  augustini var. nigrinux (Hu) M.Deng & Z.K.Zhou 2005 comb. nov.
= see above *;
Pictures

drawing 1
drawing 2