Oaks of the World

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  Quercus mangdenensis
Author Binh & Ngoc, sp. nov. 2022
Synonyms
Local names
Range Vietnam (Mang Den, in the Kon Tum Province; 1180 m)
Growth habit 20-25 m tall; trunk to 0,6-0,8 m girth;
Leaves (5.5)1116.5(19.5) (2.6)3.55.5 cm; thick and leathery; lanceolate to oblong-lanceolate; apex pointed; base broadly cuneate; margine entire; adaxially glabrous, glossy green; abaxially glabrous, bright green; midrib slightly raised adaxially, much more beneath; 5-9 veins pairs raised above, at an angle of 45-55° with midrib, curved near margin; petiole 1.3-4 cm long, glabrous.
Flowers

female inflorescence axillary or pseudo-terminal

Fruits acorn cylindrical-ellipsoid, single, 4.5-7.5 cm long, 3-4 cm wide, rounded at apex; stylopodium 1.5-2.5 mm long; basal scar flat, 2-2.5 cm in diameter; cup sessile, bowl-shaped, 4-5 cm in diameter, with 5-7 concentric rings which have an entire margin and are tomentose or glabrous; cup enclosing 1/5 of the nut; maturing first year;

Bark, twigs and
buds

bark whitish grey; young twig pale grey, hairy; adult twig hairless, greyish brown, sometimes sulcate, with lenticels; bud perulate, globose to oblate, 2.5-4 mm long, 2.5-3.5 mm in diameter, with imbricate scales in 2-3 rows, ovate-triangular, ciliate at margin, covered with white, appressed hairs outside, but glabrous inside;

Hardiness zone, habitat scattered in evergreen forests, between 1000 and 1200 m.
Miscellaneous -- Sub-Genus Cerris, Section Cyclobalanopsis.
-- Similar to Q. bidoupensis and to Q. kontumensis with a lanceolate to oblong-lanceolate leaf shape, cuneate leaf base, and bracts of cupule in 57 rings, but is distinguished from them by its leaf margin, petioles, cupules enclosure, among other features (see the comparative table between these species HERE).


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