|Author||Hickel & A.Camus 1921 Ann. Sci. Nat., Bot. X, 3: 380 1921|
|Synonyms||Cyclobalanopsis chevalieri (Hickel
& A.Camus) Hsu & Wei Jen 1993
Cyclobalanopsis nigrinux Hu 1951
|Local names||hei guo qing gang ;|
|Range||China (Yunnan, Guangdong, Guangxi), Vietnam ; 600 - 2000 m ;|
|Growth habit||10-15 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;|
|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
slender, sulcate, covered with whitish bloom when 2 years old;
|Hardiness zone, habitat||not hardy;|
A. Camus : n° 52 ;
-- Sub-genus Cerris, Section 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.
Cyclobalanopsis augustini var. nigrinux (Hu)
M.Deng & Z.K.Zhou 2005 comb. nov.
= see above *;