Description
Key Characters:
Growth Form:
Shrubs or small trees, terrestrial or epiphytic.
Stems:
Stems branched repeatedly, spreading, light gray or light brown, glabrous or rarely pubescent, with numerous helically arranged leaf scars near apex, pith solid, latex white, viscous.
Roots:
Leaves:
Leaves simple.
Alternate.
Blades oblong, elliptic, or oblanceolate.
Apex acute, acuminate, or cuspidate, rarely obtuse or rounded.
Base cuneate or attenuate, rarely obtuse or rounded.
Surfaces glabrous or pubescent, rarely muricate; Blades coriaceous or chartaceous, rarely membranous; upper surfaces glossy or dull; lower surfaces dull, paler.
Margins callose crenulate, rarely callose–serrulate.
Petiolate.
Stipules absent.
Flowers:
Flowers in inflorescences axillary, subumbellately racemose, 2(–10)–flowered, sometimes 1 flowered by abortion, glabrous or pubescent, rarely muricate; peduncle spreading, rarely deflexed or pendent, bibracteate; pedicels spreading, rarely ascending or pendent, bibracteolate.
Flowers bisexual (perfect), epigynous, zygomorphic, resupinate, protandrous.
Calyx synsepalous; tube adnate to the ovary, forming a hypanthium, hemispheric, obconic, obovoid, turbinate, or rarely oblong, smooth or with 10 longitudinal furrows, rarely muricate or with 10 longitudinal ridges; lobes 5, valvate, either less than 1⁄2 as long as the corolla, distinct or rarely connate at base, persistent, triangular or deltate, rarely oblong or ovate, firm, green, or as long as the corolla (rarely only ⅔ as long), connate for 1/5–⅘ their length, deciduous, mimicking the corolla in shape, texture, and color.
Corolla bilabiate, unilabiate, tubular, or rotate, white, green, purple, rose, magenta, or maroon; tube suberect, curved, or arcuate, dorsally cleft to near the base; lobes 5, valvate, deflexed, erect, spreading, or recurved, 1/5–3 times as long as the tube.
Stamens 5, syngenesious, alternate with the corolla lobes, included or exserted; filaments connate above, free from the corolla, purple, magenta, or white, glabrous; anthers connate, dithecal, opening introrsely by longitudinal slits, purple or white, the 3 dorsal ones a little longer than the 2 ventral ones, the latter with tufts of stiff white trichomes at apex, otherwise glabrous, or sometimes pubescent along the sutures, rarely so on the surfaces; filaments distinct or connate above, attached to the epigynous nectary disk or to base of corolla, rarely adnate to corolla tube.
Pollen tricolporate, prolate, ellipsoidal.
Ovary inferior, 2-carpellate, 2-loculed; ovule placentation axile, placentae large; style slender, terete (cylindrical), with a ring of stiff white hairs near apex; stigma 2-lobed, the lobes appressed and non–receptive as the style grows through the anther tube, pushing out pollen, after which the stigmas spread and become receptive.
Fruit:
Fruit an orange or yellow berry; subglobose; obovoid; ellipsoid; or oblong; rarely obpyriform or obconic; smooth or with 10 longitudinal furrows; rarely muricate or with 10 longitudinal ridges; pericarp thick; leathery; placentae juicy or spongy; apex truncate; crowned with a low circular rim and base of style.
Seeds numerous; tiny; dark brown or black; minutely foveate–reticulate; shiny; with a straight; short to spatulate dicotyledonous embryo embedded in oily endosperm.
Ploidy:
2n = 14*.
Habitat:
Elevation Range: