Description
Herbaceous or shrubby, often aromatic.
Leaves serrate, gland-dotted.
Flowers small or medium, variously arranged in densely spicate or densely capitate inflorescences or in few-flowered clusters, often secund.
Stamens 4, declinate;
Distribution
America present, Old World tropics present
Species over 300, all from America The following 5 spp. naturalized as weeds in the Old World tropics.
Citation
EPLING 1936: Kew Bull.: 378
O.K. 1891 – In: Rev. Gen. Pl.: 525
KENG 1969 – In: Gard. Bull. Sing.: 90
JACQ. 1949 – In: Rev. Mus. La Plata n.s.: 153
BRIQ. 1897 – In: E. & P., Nat. Pfl. Fam. 4: 333
BTH. 1876 – In: B. & H., Gen. Pl. 2: 1178
