米扬 mi yang

Bleekrodea tonkinensis Dubard & Eberhardt, Compt. Rend. Hebd. Séances Acad. Sci. 145: 632. 1907; Teonongia tonkinensis (Dubard & Eberhardt) Stapf.

Trees 6-12 m tall, evergreen; monoecious with male and female flowers on same or different inflorescences. Bark gray, smooth. Branchlets thin. Stipules small, caducous. Petiole ca. 3 mm; leaf blade obovate-oblong to oblong-lanceolate, 5-11 × 2.5-4 cm, papery, abaxially densely covered with small tubercles and with sparse hairs on veins, adaxially glabrous, base cuneate, margin irregularly undulate or with 3 or 4 pairs of teeth apically from middle, apex ± caudate to acuminate and with an asymmetric acumen; secondary veins 5 or 6 on each side of midvein. Bisexual inflorescences when present with 1 central sessile female flower surrounded by male flowers. Male inflorescences axillary, 6- or 7-flowered, green, globose, 3-7 mm in diam.; bracts adaxially long pubescent; bracteoles 2, at base of calyx. Female inflorescences 1-flowered. Male flowers: calyx lobes 4 or 5, ovate, shortly pubescent, margin ciliate; filaments long; anthers globose, extrorse; pistillode cubic. Female flowers: calyx lobes 4, ovate, pubescent, basally adnate with ovary; style linear, apically branched and slightly curved, 3-4 mm. Drupes ± globose, 7-10 mm in diam., dehiscent, not enclosed by ± reflexed calyx lobes, without a fleshy base. Fl. spring to summer.

Limestone areas in shade; ca. 500 m. SW Guangxi, Hainan, SE Yunnan [N Vietnam].

This species is also cultivated in Guangdong and Hainan for gum.