Cleistanthus concinnus Croizat

"Cleistanthus anomalus Merrill & Metcalf" (Croizat, J. Arnold Arbor. 23: 39. 1942) lacks a validating description but seems to belong here.

Erect shrubs up to 4 m tall; stem and branches terete; branchlets pubescent when young, glabrous at maturity. Stipules angular or subulate, 1-3 mm inserted at bilateral base of petiole, brown; petiole 1-4 mm, pubescent to glabrous; leaf blade papery, elliptic or ovate, 1-7 × 0.5-3 cm, base acute, rounded, obtuse, or slightly cordate, apex acute, obtuse, or retuse, rarely shortly acuminate, glabrous on both surfaces, dark green adaxially, greenish abaxially; lateral veins 7-9 pairs, obliquely ascendant, anastomosing near margin, slightly elevated on both surfaces. Flowers androgynous, often grouped into glomerules; inflorescences axillary or inserted at middle or lower part of aphyllous branchlets, 5-7-flowered; bracts small, broadly ovate, lanate inside. Male flowers: calyx ca. 4 mm, red, glabrous; sepals 5, oblong, acute, valvate; petals 5, small, rhombic, ca. 0.4 mm, membranous, glabrous; disk annular, with 5 crenulations; stamens 5, ca. 3 mm; filaments connate; anthers ca. 2 mm, 2-celled, longitudinally dehiscent. Female flowers: calyx ca. 3 mm, glabrous; sepals 5, triangular, acute; petals 5, spatulate, ca. 1 mm, glabrous; disk cup-shaped, ca. 1 mm, erose at apex; ovary ovoid, ca. 1 mm, glabrous; styles 3, ca. 1 mm, free or connate at base, shallowly bifid. Capsules sessile, oblate-spherical, 7-8 mm in diam., gray-brown, septicidal and loculicidal, reticulate-elevated outside when mature, endocarp yellowish. Seeds subangular, ca. 3 mm. Fl. Jan-Mar, fr. Apr-Jun.

Hainan (Changjiang, Dongfang, Ledong) [Vietnam].

Open forests or scrub on sandy or clayey soils; 200-500 m.

Cleistanthus dongfangensis (P. T. Li) H. S. Kiu; Phyllanthus dongfangensis P. T. Li.

Cleistanthus concinnus là một loài thực vật có hoa trong họ Diệp hạ châu. Loài này được Croizat mô tả khoa học đầu tiên năm 1942.