(Acisanthera variabilis)
Rhexia species are herbaceous perennials. Opposite leaves are simple, ovate to lanceolate and have typical acrodromous venation (prominent arcuate nerves) of Melastomataceae. Stems have four faces; one set is broader and convex, the other set is narrower, concave. Flowers are actinomorphic (radially symmetrical), 2-3cm in diameter, pink-purple to white, (yellow in R. lutea), petals 4, sepals 4, stamens 8. Bright yellow anthers are long and curved counterclockwise. Seeds are cochleate (noncochleate in R. alifanus).