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FOC | Family List | FOC Vol. 13 | Melastomataceae

6. Plagiopetalum Rehder in Sargent, Pl. Wilson. 3: 452. 1917.

偏瓣花属 pian ban hua shu

Shrubs or herbs. Stems usually 4-sided, narrowly winged when young, often subterete when older. Leaves petiolate; leaf blade membranous to papery, secondary veins 1 or 2 on each side of midvein, tertiary veins parallel, margin serrulate to subentire but sparsely setose ciliate. Inflorescences terminal or axillary, umbellate corymb, rarely umbellate; bracts often lanceolate to triangular-lanceolate. Pedicel 4-sided; bracteoles 2. Hypanthium campanulate, usually contracted at middle, 4-sided, 8-ribbed. Calyx lobes 4, often ovate, apex apiculate. Petals 4, red, purple, or sometimes pink, ovate to obovate, oblique. Stamens 8, whorls unequal in length; anthers lanceolate to long lanceolate, not tuberculate; connective not or minutely inflated at base, shortly spurred. Ovary inferior, 4-celled, apically denticulate. Style filiform; stigma apiculate. Capsule globose to ovoid-urceolate, 4-sided; hypanthium often glabrous. Seeds numerous, long cuneate to narrowly triangular, small, ribbed on angles, densely tuberculate.

Two species: China, Myanmar, Vietnam; two species (one endemic) in China.

Plagiopetalum is often considered a synonym of Anerincleistus Korthals. The genus was revised by Hansen (Bull. Mus. Natl. Hist. Nat., B, Adansonia 10: 127-136. 1988), and his species concepts are followed here.

1 Shrubs 50-70(-200) cm tall; leaf blade 2-14 × (0.7-)2.5-6.5 cm; pedicel 6-10 mm.   1 P. esquirolii
+ Herbs 12-22 cm tall; leaf blade 0.9-1.9 × 0.6-1.4 cm; pedicel ca. 1 mm.   2 P. tenuicaule

Lower Taxa


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