Tên Khoa học: Hopea vietnamensis H. V. Sam & D. VuTên tiếng Anh: Tên tiếng Việt: Sao việtTên khác:
Evergreen trees, 30-40 m tall, 60-80 cm in diameter. Bark thin, white grey, not peeling when young, peelingoff into large pieces when old. Branches slender, white grey. Leaves simple, alternate, distichous ovoid or lanceolate, tip attenuate, base rounded, a little bit asymmetrical, 5-11cm long, 3-5cm wide. Basal veins 5-6 pairs, the two lower veins usually not obvious, lateral veins 3-5 pairs, without domatia at the lower surface of the leaves. There is no reticulate tertiary venation. Petioles thin, 6-10 mm long, covered with yellow grey tomentum when young, soon caducous. Inflorescence and axillary panicle, 6-11cm long, rachis glabrous, bud c. 6 mm long. Sepals 5, nearly rounded or ovoid, 2-2,5 mm long, top convex, tomentose at margin and outside. Petals 5, obovoid or elliptical, pale yellow, c. 5 mm long; apex acuminate and oblique, dense, grey tomentose outside and slightly pubescent inside. Stamens 15, arranged in two rings; inside round with 10 and outside round with 5 stamens Anthers ellipsoid, 0,5-0,7mm long, filaments 1,3-1,6 mm long, connectival appendage about 2 times as long as anther, Ovary superior, pyriform, shortly fine pubescent with short style, 3-locular, two ovules in each locule. Fruits ovoid, c. 1,7cm long and c. 0,9cm wide, pointed at top, brownish-yellow when mature, wings 2, 4-6cm long, c. 1,2 cm wide; apex obtuse, glabrous, about 11 parallel veins on each wing.