Wissadula Medik.
Contenido
Descripción
Herbs or subshrubs, usually erect, stellate-pubescent or sometimes glabrate. Leaves petiolate, the blades broadly ovate to narrowly triangular, entire or crenate-dentate, lacking foliar nectaries. Flowers sometimes solitary in the leaf axils, usually in condensed or open terminal panicles; involucel absent; calyx 5- lobed, usually small; petals usually yellowish and small, sometimes white; androecium included, antheriferous at apex; styles 3-6, slender, the stigmas capitate. Fruits schizocarpic but septicidal dehiscence often incomplete (the fruit thus pseudocapsular); mericarps 3-6, divided into indehiscent lower cell and dehiscent upper cell by constriction, apically bulbous-apiculate; seeds (1-) 3, with 1 in lower cell and usually 2 in upper cell, the lower seed relatively densely pubescent, the upper seeds less so. Base chromosome number: x = 7.A
Discusión taxonómica
Wissadula, a genus of approximately 25 species from Africa and South America, extends northward to the West Indies and Mexico; one species reaches south ern Texas. The genus has recently been restricted by the exclusion of Allowissadula and Bastardiastrum; the residual genus Wissadula is smaller and more natural than previously circumscribed. Four species occur in Mexico.A