Oaks of the World

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  Quercus honbaensis

Binh, Tagane & Yahara 2018

Local names
Range Vietnam (Khanh Hoa Province, Mount Hon Ba); 200-600 m;
Growth habit to 12 m;

(4-) 11-16.5 cm x (1.5-) 2-5.2; lanceolate to oblanceolate; apex acute; base cuneate; margin not undulate, distinctly serrate in apical 2/3 to apical 5/6; both sides glabrous; midrib slightly raised above, prominent beneath; 9-16 pairs of secondary veins remotely impressed adaxially, prominent abaxially, at an angle of 40-45° from midrib; tertiary veins obscure; petiole 0.8-1 cm long, tomentose at first, becoming glabrous;


acorn 2.3-2.8 cm long, obovoid to ellipsoid, obtuse at apex, sparsely hairy especially around the stylopodium and the base; single or paired on an erect, glabrous, 0.5-1.5 cm long rachis; cupule sessile, obconical, 1.5-1.8 cm in diameter, 1.4-1.6 cm high, with 6-8 concentric rings of scales, undulate at margin, cup enclosing 1/3 to 1/2 of the nut; basal scar 0.7-0.8 cm in diameter, convex;

Bark, twigs and

young twig greyish-brown, 1-1.2 mm thick, curly pubescent, sometimes sulcate; old twig lenticellate; bud ovoid 3-4 mm long, with 4-6 rows of imbricate scales, ovate-triangular, pointed at tip, ciliate at margin, covered with appressed hairs;
Hardiness zone, habitat

-- Sub-genus Cerris, section Cyclobalanopsis;
-- Included in the "Q. langbianensis Complex";
-- Threatened (IUCN Red List Category : CR)

-- Differs from Q. langbianensis sensu stricto in having a shorter petiole, a greater number of lateral veins and obconical cupules;

Subspecies and