Erect herbs; Leaves opposite, or upper ones alternate; petiolate; lamina ovate, margins toothed; penni-nerved. Inflorescence heads in corymbs or loose panicles, many flowered, involucre, campanulate; bracts imbricate. Flowers corollas tubular, equal regular; Fruit achenes, oblong, 5-angular; scales. Derivation of name: from a Singhalese name for a plant now known as Blainvillea acmella. Worldwide: 40 species in tropical America and West Indies. Caprivi: 1 cultivated taxon. |