Oaks of the World

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  Quercus donnaiensis
Author

A. Camus 1935 Chênes Atlas 2: 119

Synonyms
Local names
Range Vietnam (Province du Haut-Donnaï); 1000-1700 m;
Growth habit 25 m;
Leaves

10-16 cm x 4-5; oval-lanceolate; base attenuate; apex long acuminate; margin not undulate, with scattered teeth in upper 1/3; densely tomentose at first, becoming hairless adaxially; abaxially glabrous or with a persistent tomentum along midrib; slightly glaucous; midrib nearly flat above, prominent beneath; 9-14 pairs of secondary veins, at an angle of 60° from midrib; tertiary veins not visible; petiole tomentose 1-2 cm long;

Flowers males catkins appear after the female ones; female catkins 2.5 cm long, with yellowish tomentose rachis, bearing 5-6 tomentose flowers; 4 styles; stigmas thick, dark;
Fruits

acorn subglobose 1.5-1.7 cm long x 1.2 cm wide, loosely pubescent, rounded at tip, 4 to 5 together on a slim rachis 7-8 cm long; basal scar convex; cupule halfround 1.5 cm in diameter, with 5-6 concentric rings of nearly entire scales, enclosing 1/2 of the nut; maturing in 2 years.

Bark, twigs and
buds

young twigs densely golden tomentose, woolly, becoming glabrous, dark brown; bud ovoid-rounded with scales oval silky outside; stipule linear, tomentose;
Hardiness zone, habitat low montane broadleaf evergreen forests;
Miscellaneous

-- Camus n° 5;
-- Sub-genus Cerris, section Cyclobalanopsis;
-- The yellow tomentum covering the whole young tree is a distinguishing feature;
-- Threatened (IUCN Red List Category : CR)

-- This taxon, often considered as synonym of Q. langbianensis, is today included by Binh & Ngoc 2018 in the "Q. langbianensis Complex"

 

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