Description from Flora of China
Ehretia microphylla Lamarck, Encycl. Meth. 1: 425. 1783; Carmona heterophylla Cavanilles; E. buxifolia Roxburgh; E. buxifolia var. latisepala Gagnepain; E. dentata Courchet.
Shrubs 1-3 m tall, much branched; bark brown; branches slender, internodes 1-2 cm, sparsely hirtellous when young; buds light brown, globose, tomentose. Petiole short; leaf blade obovate to spatulate, 1.5-3.5 × 1-2 cm, leathery, abaxially subglabrous, adaxially hirtellous or spotted, base attenuate, margin coarsely crenate, apex rounded to acute. Glomerules spreading, 0.5-1.5 cm wide; peduncle slender, 1-1.5 cm, pubescent. Pedicel 1-1.5 mm, or ± obsolete. Calyx 4-6 mm, parted nearly to base; lobes linear or linear-oblanceolate, 0.5-0.8 mm, attenuate below middle, spreading hirtellous, densely appressed pubescent inside. Corolla white or slightly reddish, campanulate, 4-6 mm; lobes spreading, oblong, longer than tube. Filaments 3-4 mm, inserted near base of corolla; anthers oblong 1.5-1.8 mm, exserted. Style 4-6 mm, glabrous. Drupes 3-4 mm in diam.; endocarp globose, reticulate-wrinkled, 2-3 mm in diam., apex short beaked. 2n = 32.
Flora of Java treats Carmona microphylla as a synonym of C. retusa (Vahl) Masamune, based on Ehretia retusa Vahl (Symb. Bot. 2: 42. 1791).
Thickets. S Guangdong, Hainan, Taiwan [Indonesia, Japan (Ryukyu Islands); Australia]