Guatteria rumphii Blume ex Henschel, Vita Rumphii, 153. 1833; G. jenkinsii J. D. Hooker & Thomson; Polyalthia jenkinsii (J. D. Hooker & Thomson) J. D. Hooker & Thomson.

Trees to 15 m tall. Branches minutely rust-colored pubescent when young, soon glabrous. Petiole 5-12 mm, glabrous; leaf blade oblong-lanceolate, 10-17 × 3-7 cm, papery to leathery, glabrous, adaxially shiny dark green, secondary veins 7-10 on each side of midvein and prominent on both surfaces, base cuneate to rounded and sometimes oblique, apex acuminate. Inflorescences axillary, 1-flowered. Flowers 4-7 cm in diam. Pedicel 1-2 cm, appressed pubescent. Sepals subovate to triangular, 6-15 × 3-8 mm, outside puberulent, apex acute. Petals greenish to yellowish, elliptic, oblong-elliptic, or oblong, 3-5.5 × 1.5-3 cm, thin, puberulent or glabrous, apex obtuse; inner petals slightly shorter than outer petals. Stamens oblong; connectives apically broadly rounded, concealing anther cells. Carpels many, oblong, pubescent; ovule 1 per carpel, basal; stigmas clavate to capitate. Fruiting pedicel ca. 2 cm × 2 mm; monocarp stipes 5-10 × ca. 1 mm, glabrous; monocarps many, ellipsoid, ca. 10 × 5 mm, base rounded, apex acute. Fl. May-Oct, fr. Jul-Apr. 2n = 18.

Forested slopes at lower to middle elevations. Hainan [Indonesia, Malaysia, Philippines, Thailand].