4. Xanthophyllum hainanense Hu, J. Arnold Arbor. 6: 142. 1925.
黄叶树 huang ye shu
Trees 5-20 m tall; bark gray, longitudinally thinly fissured. Branchlets terete, slender, glabrous. Petiole 6-10 mm, transversely rugose, sulcate adaxially; leaf blade yellow-green when dry, ovate-elliptic to oblong-lanceolate, 4-12 × 1.5-5 cm, leathery, both surfaces glabrous, midvein and lateral veins raised on both surfaces, lateral veins 9-11 pairs, anastomosing near margin, veinlets reticulate, raised abaxially, distinct adaxially, base cuneate or obtuse, margin sometimes undulate, apex long acuminate. Racemes or small panicles axillary or terminal, 3-9 cm; peduncles and pedicels densely pubescent; bracteole 1, caducous, lanceolate. Flowers fragrant, small. Sepals with both surfaces pubescent, ciliate; outer 3 ovate, small, ca. 2 mm, apex acute; inner 2 elliptic to oblong, large, ca. 4 mm, apex rounded. Petals yellow-white, elliptic or oblong-lanceolate, ca. 7 mm, apex obtuse, thinly ciliate. Stamens 8, free, 4(-8) mm, lower parts villous; anthers basifixed, ellipsoidal, ca. 0.5 mm. Ovary pitcher-shaped, ca. 1 mm in diam., densely pubescent; ovules 4; style 3-6 mm, slightly pubescent at base; stigma capitate. Drupe yellowish, 1.5-2 cm in diam., pubescent or subglabrous; fruit stalk terete, ca. 5 mm, stout, pubescent. Seed yellowish, subglobose, ca. 8 mm in diam. Fl. Mar-May, fr. Apr-Jul.
Mountain forests; 100-600 m. Guangdong, Guangxi, Hainan [Vietnam].