13. Polyalthia longifolia (Sonnerat) Thwaites, Enum. Pl. Zeyl. 398. 1864.
长叶暗罗 chang ye an luo
Uvaria longifolia Sonnerat, Voy. Indes Orient. 2: 260. 1782; Guatteria longifolia (Sonnerat) Wallich; Unona longifolia (Sonnerat) Dunal.
Trees to 20 m tall; trunk straight. Branches finely striate, minutely puberulent when young, soon glabrous. Petiole 5-10 mm; leaf blade ovate-oblong to ovate-lanceolate, 11-31 × 2.5-8 cm, stiffly membranous to thinly leathery, glabrous, abaxially pale, adaxially dark glossy green, secondary veins 18-24 on each side of midvein, reticulate veins raised on both surfaces, base cuneate, obtuse, or rounded, margin undulate, apex acuminate. Inflorescences axillary, fasciculate and shortly pedunculate, racemose, or umbelliform and sessile, mostly many flowered; peduncle to 0.7-1.5 cm; rachis to 1 cm. Pedicel 2-4 cm; bracteole usually 1, at middle of petiole, to 1 mm, tomentulose. Sepals ovate-triangular, 1.5-3 × 1.5-1.8 mm, outside tomentulose, inside glabrous. Petals greenish yellow, narrowly triangular-lanceolate, 1.3-1.5 × 0.2-0.4 cm, subequal, spreading, inside puberulent except basally, base broad, apex acute. Stamens 8-10 cm; connectives apically convex. Carpels 20-25, ca. 1.5 mm, apex tomentulose; ovule 1 per carpel; stigmas sessile, rectangular to oblong, pubescent, with a groove on inner side and continuing down inner side of ovary. Monocarp stipes 1-2 cm; monocarps 4-8, purple, ovoid, 2-2.5 × ca. 1.5 cm, glabrous. Seed pale brown, ovoid, ca. 2 × 1.4 cm, usually with a longitudinal groove. Fl. May-Jun, fr. Jul-Sep. 2n = 18.
Cultivated; 300-400 m. Hainan, Taiwan, Yunnan [native to India and Sri Lanka].
Polyalthia longifolia is grown for its wood and as an ornamental throughout SE Asia.