Oaks of the World

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  Quercus xuanliensis
Author Binh, Ngoc & Bon 2018
Synonyms  
Local names  
Range North Vietnam (Thuong Xuan District, Thanh Hoa Province, Xuan Lien Nature Reserve); 810 m;
Growth habit to 18 m;
Leaves

(6-)8-11(-15) cm x 3-4,5(-5); leathery; oblong-elliptical or oboval; apex acuminate, acumen up to 0.6 cm long; base cuneate; margin recurved, serrulate in the 1/5-1/7 apical part; both sides hairless; light green underneath; midrib nearly flat adaxially, prominent abaxially as are the lateral veins; 8-11 vein pairs, at an angle of 40-45° with the midrib, straight; tertiary veins scalariform, evident abaxially; petiole 1-2 cm long, glabrous;

Flowers  
Fruits acorn ellipsoid to cylindrical-ellipsoid, 6-6.5 cm long (cup included), pointed at apex, with a hairy, 4 mm long stylopodium; solitary or paired; sessile on a terminal or axillary, erect, 8-10 mm long, glabrous rachis; cup bowl-shaped 1.3-1.7 cm high, 1.9-2.1 cm wide, enclosing1/5 of acorn, hairless or tomentose outside, densely hairy inside; cup-scales in 7-8 concentric rings with entire margin; basal scar 9-10 mm in diameter, convex;

Bark, twigs and
buds

bud ellipsoid, 9 mm long, 4 mm in diameter, with imbricate scales in 4-5 rows, oval-triangular, with obtuse apex and ciliate margin, both sides covered with whitish to yellowish-brown hairs; mature twig hairless, lenticellate; stipules linear-lanceolate, 10-14 mm long, hairless on internal face, pubescent on external one;
Hardiness zone, habitat evergreen forests;
Miscellaneous -- Sub-genus Cerris, Section Cyclobalanopsis;
-- Only one individual found; qualified as Critically Endangered, according to the IUCN Red List;
Subspecies and
varieties
 
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