Four new species of (Sonerileae, Melastomataceae) from Vietnam.

is a genus currently treated in the polyphyletic . Recent phylogenomic analyses have identified a morphologically cohesive lineage referred to as the (raphides) clade, which should be excluded from and treated as a distinct genus under the name . Morphological and phylogenomic data have confirmed that four new species collected from Vietnam are part of the (raphides) clade. They are described herein as , , , and . is phylogenetically closest to , and morphologically to and , but is distinct in the 4- to 8-lobed calyx, 28 × 9 mm, apically long acuminate petals, and 1-2 mm pedicel at fruiting stage. , , and are phylogenetically most closely related. is characterized by its prostrate habit, small size, glabrous, obovate to obovate-lanceolate leaf blade, and solitary flower. and resemble each other in habit, leaf size and shape, and sessile or near sessile inflorescences but can be easily distinguished by the indumentum of the stems and leaves.