Herbs or shrubs [lianas], perennial or, rarely, annual; taprooted or rhizomatous. Stems woody stocks, acaulescent, or erect to prostrate, nodes swollen; indument of simple hairs, capitate glands that may secrete water or calcium salts, or multicelled glandlike structures. Leaves often basal, alternate, spiralled; stipules absent; petiole present or absent; blade linear to broadly obovate, ovate, or round, margins entire or lobed. Inflorescences terminal or axillary cymes, panicles, racemes, or corymbs, or solitary heads; bracts herbaceous, scarious, sometimes absent; involucral bracteoles (epicalyces) immediately subtending calyces usually present. Pedicels absent or present (short). Flowers bisexual, radially symmetric; perianth and androecium hypogynous; sepals persistent in mature fruits, 5, connate into 5- or 10-ribbed tube, mostly dry and membranous, sometimes petaloid, toothed or with distinct simple or lobed limbs; petals 5, nearly distinct, connate at bases or for most of their length (corolla salverform); blade clawed or claw absent, margins entire; corona absent; stamens 5; filaments adnate to bases of petals or free; ovary superior, 1-locular, placentation basal; ovules 1 per ovary, anatropous, bitegmic, crassinucellate; styles 1 with apically lobed stigma, or 5, each with linear stigma. Fruits utricles, achenes, or capsules. Seeds 1, embryo straight, endosperm present or absent.
Este sitio es resultado de la colaboración entre los herbarios del noroeste de México y El Consorcio de SEINet. Está administrado por el Herbario de la Universidad de Sonora