Description from Flora of China
Cassine discolor Wallich in Roxburgh, Fl. Ind. 2: 378. 1824; Microtropis sessiliflora Merrill & F. L. Freeman.
Evergreen small trees or shrubs, 2.5-7 m tall. Petiole 5-10 mm; leaf blade rectangular or oblong, sometimes broadly lanceolate to narrowly ovate-elliptic, 7.5-19 × 2.5-8 cm, thickly papery or leathery, abaxially gray-brown, adaxially generally pale green when dry, base cuneate or broadly cuneate, apex caudate, tail up to 1.5 cm; midvein prominent on both surfaces, abaxially more conspicuous, secondary veins 5-8 pairs, slender, curved, prominent on both surfaces. Cymes glomerate, axillary or on branch axis, mainly 7-15-flowered; peduncle short, 2.5-6 mm, secondary peduncle 1.5-2.5 mm, third peduncle ca. 1 mm. Flowers 5-merous, subsessile; sepals slightly semiorbicular, imbricate, margin erosely toothed, teeth dark brown; petals slightly fleshy, rectangular, 2.5-3.5 × 1.5-2.5 mm, adaxially longitudinally angulate in center. Disk annular. Filament 1.5-2.5 mm; anther rectangular. Ovary elliptic-ovate; style absent; stigma 4-lobed. Capsule broadly elliptic, 10-14 × 8-10 mm, surface with thin, longitudinal costa formed by small wartlike elevations. Fl. and fr. Sep-Mar.
Evergreen forests; 800-1600 m. S Yunnan [Bhutan, India, Malaysia (peninsular), Myanmar, Thailand (peninsular), Vietnam].