Based on Taylor & Gereau (2011: p. 99)
Soft to suffrutescent herbs, shrubs, or infrequently small trees, with raphides, unarmed, glabrous or variously pubescent, sometimes unbranched, sometimes apparently stoloniferous, often fleshy and rather succulent. Leaves opposite or sometimes in verticils of 3-4, sessile to petiolate, thin-textured or fleshy in life and drying thin-textured, infrequently bullate, without acarodomatia in the leaf axils but occasionally with paired swollen vesicles at base of blade; venation eucamptodromous or brochidodromous, higher-order venation not lineolate; stipules interpetiolar or shortly fused around stem, deciduous or sometimes with truncate basal portion persisting at least shortly after upper portion has fallen, subtruncate to triangular, sometimes markedly succulent, sometimes with a pyramidal or ornamented medial projection, rarely 2-lobed, infrequently apparently glandular. Inflorescences axillary (i.e., produced in both axils of the node), borne with the vegetative leaves and/or along bare stem below leaves, sessile to pedunculate, capitate, glomerulate, fasciculate, or congested to laxly cymose, bracteate or with bracts reduced, axes dichasial or sometimes becoming cincinnate or scorpioid-racemiform. Flowers bisexual, homostylous, sessile to pedicellate, apparently protandrous, apparently diurnal; calyx limb shortly to deeply 4-lobed; corolla funnelform, salverform, or rotate (i.e., with a narrow cylindrical tube that is significantly shorter than the widely spreading lobes), variously white, yellow, pale green, yellowish green, pink, salmon, red, or purple, internally glabrous, lobes 4, triangular, in bud imbricate variously simply, alternatively, or quincuncially, with all arrangements sometimes found on the same plant (Lorence & Dwyer, 1988); stamens (3)4(5), exserted, inserted in lower part of corolla tube, anthers narrowly oblong or ellipsoid-oblong, often bright white, with connective sometimes prolonged at one or both ends; ovary 2(--4)-celled, ovules numerous, peltate on axile placentas; stigmas 2(--4), linear, clavate, or lancecolate, exserted, often bright white or strikingly colored. Fruits baccate, generally subglobose to elipsoid, fleshy and variously juicy, smongy, meal, or ultimately capsular with irregular dehiscence (Lorence & Dwyer, 1988), at maturity white, pink, orange, red, or purple-black; seeds numerous, small (generally 0.2-0.3 mm long), irregularly angled, reticulate to foveolate, with surfce granular etween fenestrated walls.