无柄山柑 wu bing shan gan

Shrubs ca. 3 m tall. Twigs pale green when dry, slender, terete, base without subulate scales, glabrous, spineless or with small ascending stipular spines. Petiole 1-2 mm; leaf blade elliptic to slightly obovate-elliptic, broadest at middle or sometimes slightly beyond, 9-12.5 × 3.5-5 cm, 2.5-3 × as long as wide, abaxially light green, adaxially dark green when fresh but grass-yellow when dry, both surfaces glabrous, midvein and secondary veins abaxially raised and adaxially impressed, secondary veins 9-11 on each side of midvein, rejoining before reaching leaf margin, and impressed or abaxially almost flat, base cordate, apex acuminate to long acuminate and with a 0.7-1.6 cm tip. Inflorescences superaxillary rows of 1 or 2 flowers. Flowers not seen at anthesis. Pedicel ca. 1 cm. Fruit only seen when immature, subglobose but slightly oblate, 8-9 mm in diam., surface with small slightly verrucose particles; pericarp firm when dry; fruiting pedicel 2-3 cm, slender, glabrous; fruiting gynophore 2.5-3.8 cm, slender, glabrous. Seeds 1 or 2 per fruit, pale red, reniform, 6-7 mm in diam., smooth. Fl. unknown (in bud in early Jun), fr. Aug-Oct.

Valley forests; 500-1000 m. NW and SW Guangxi (Bose, Longzhou) [N Vietnam].

This species is reported here for the first time from Vietnam (Cao Bang Province, L. Averyanov et al. CBL 1243, MO).