Bastardiastrum (Rose) D.M. Bates
Contenido
Descripción
Widely branching shrubs or subshrubs 0.5-2.5 m tall, densely stellate-pubescent to glabrate, sometimes viscid, the stems sometimes with purplish nodes. Leaves petiolate, the blades ovate, usually cordate, serrate or dentate to subentire, acute or acuminate, usually soft-pubescent, often discolorous, lacking foliar nectaries. Flowers solitary (or clustered) in the leaf axils, commonly aggregated into racemes or panicles; involucel absent; calyx usually ribbed, usually pubescent, equal to and clasping the fruit; petals 0.5-1.5 cm long, white to pale lavender; staminal column greatly shortened (rudimentary), the filaments 3.5-9 mm long, slender, erect, ca. 30, pallid; styles 3-4, pallid, slender, the stigmas dark, capitate. Fruits schizocarpic, obovoid, pubescent; mericarps 3 or 4 (rarely 5), apically rounded, more or less divided into an upper and lower cell, the upper 2-seeded, the lower 1-seeded, the upper cell dehiscent; seeds somewhat pubescent, the seed of the lower cell (when present) more prominently so. Base chromosome number: x = 15.A
Discusión taxonómica
Bastardiastrum is a wholly Mexican genus of eight species, extending along the Pacific coast from Sonora to Chiapas, usually below 500 m but reaching 1600 m in Guerrero and Jalisco.A