Cedronella

Perennial aromatic herbs, woody at base; branches quadrangular, glabrous except for a ring of septate hairs at nodes. Leaves petiolate, opposite, 3(–5)-foliolate, margin serrate. Inflorescence a dense, terminal thyrse, with 6–12-flowered cymes in axils of narrow, simple or 3- foliolate bracts, the lower ones often separated from the rest; flowers pedicellate. Calyx tubular to campanulate, 13–15-nerved, 5-lobed, lobes equal, acute. Corolla 2-lipped, the adaxial lip erect, somewhat hooded, 2-lobed, abaxial lip with 3 unequal lobes with the central one longest; stamens 4, fertile, attached near throat of the corolla-tube, ascending to under upper lip or slightly exserted, upper pair longer than lower pair, anthers with 2 fertile, parallel locules. Mericarps smooth, glandular-pubescent.