Urena L.
Contenido
Descripción
Shrubs 0.5-2 m tall, more or less stellate-pubescent. Leaves petiolate, the blades variable, often 3-5-angled, -lobed, or -parted, less often ovate, oblong, or lanceolate, crenate or serrate, with one or more prominent foliar nectaries on the abaxial side. Flowers solitary or glomerulate in the leaf axils or forming terminal racemes; pedicels usually short; involucel gamophyllous, 5-lobed, the lobes alternate with the lobes of the calyx; calyx S-lobed; petals rose or lavender; androecium included, apically 5-dentate, the filaments short; styles 10, slender, the stigmas capitellate. Fruits schizocarpic, 5-lobed, the lobes convex; mericarps 5, prominently glochidiate (in ours) or smooth, essentially indehiscent; seeds solitary, glabrous. Base chromosome number: x = 7.A
Discusión taxonómica
Urena is a genus of ca. six species, with two species nearly pantropical. These two species occur sporadically in Mexico, probably as adventives.A