20. Adinandra howii Merrill & Chun, Sunyatsenia. 5: 131. 1940.
保亭杨桐 bao ting yang tong
Trees 6-7 m tall. Young branches reddish brown, glabrous; current year branchlets grayish brown, sparsely appressed pubescent when young but glabrescent; terminal buds ovate, ca. 1.5 cm, densely gray appressed pubescent. Petiole 3-5 mm, sparsely pubescent or glabrescent; leaf blade oblong-elliptic, 6-11 × 2.5-4 cm, leathery, abaxially pale green and appressed pubescent when young but glabrescent, adaxially dark green, shiny, and glabrous, secondary veins 15-20 on each side of midvein and visible on both surfaces, base cuneate, margin serrulate, apex acuminate. Flowers axillary, solitary. Pedicel 1.5-2 cm, glabrous; bracteoles caducous. Sepals broadly ovate to ovate, 6-8 × 4-5 mm, glabrous, margin entire or reddish brown glandular serrulate, apex obtuse. Petals white, ovate, 8-11 × 6-8 mm, outside gray appressed pubescent along median portion. Stamens 30-35, 5-6 mm; filaments 3-4 mm, almost distinct, glabrous; anthers ovate to linear-oblong, 1-1.5 mm, with filiform trichomes, connective exserted. Ovary ovoid, glabrous, 3-loculed with many ovules per locule; style 3-3.5 mm, completely united, glabrous. Fruit red when mature, ovoid, ca. 1 cm in diam., many seeded. Seeds brown. Fl. Jul-Aug, fr. Sep-Oct.
● Forests on mountain slopes or along streams; 900-2300 m. Hainan.