2. Disepalum plagioneurum (Diels) D. M. Johnson, Brittonia. 41: 366. 1989.
斜脉异萼花 xie mai yi e hua
Polyalthia plagioneura Diels, Notizbl. Bot. Gart. Mus. Berlin-Dahlem 10: 886. 1930; Enicosanthellum plagioneurum (Diels) Bân.
Trees to 15 m tall. Branches brown to dark gray, rust-colored sericeous, glabrescent. Petiole 5-10 mm, appressed sericeous, glabrescent; leaf blade narrowly elliptic, oblong, lanceolate, or oblanceolate, 8-22 × 3-7.5 cm, papery to thinly leathery, abaxially densely rust-colored sericeous but soon sparsely appressed pubescent to glabrescent, adaxially shiny and glabrous, secondary veins 8-12 on each side of midvein, arcuately ascending, and prominent on both surfaces, base broadly cuneate to decurrent, apex acute to shortly acuminate and sometimes with a 3-9 mm acumen. Inflorescences terminal or leaf-opposed, 1-flowered. Flowers 5-10 cm in diam. Pedicel 3-5 cm, rust-colored pubescent. Sepals broadly ovate, 1.5-2 × 1.3-1.7 cm, pubescent to sparsely pubescent, apex obtuse to apiculate. Petals yellowish green, broadly obovate, 2.2-4 × 1.2-3 cm, subequal, thickly papery when dry, appressed tomentulose, apex obtuse to rounded. Stamens oblong, base attenuate; connectives apically truncate, puberulent. Carpels linear, 1.5-2 mm, rust-colored appressed pubescent; ovules 1 or 2 per carpel, basal. Fruiting pedicel 4.5-10 cm × 2-5 mm; carpophores 2-7 cm, pinkish red, pubescent or glabrescent; monocarps to at least 20, ripening black but grayish black when dry, ellipsoid to ovoid, 1-1.6 × 0.8-1.1 cm, glabrescent, apex dilated. Seeds 1 or 2 per monocarp, ellipsoid, 11-12 × ca. 8 mm. Fl. Mar-Aug, fr. Sep-Dec.
Forested slopes, often in valleys; 500-1600 m. Guangdong, Guangxi, S Guizhou, Hainan [Vietnam].