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Herbs erect, perennial and often woody at base, juice watery. Leaves opposite; petiole short, intra-and interpetiolar glands present; leaf blade herbaceous to somewhat leathery, entire. Flowers terminal and axillary, solitary or rarely in 2-or 3-flowered cymes. Sepals small, narrowly oblong, awl-shaped, without glands. Corolla purple, red, pink, or white, salverform; tube glabrous or sparsely puberulent, throat constricted, woolly to velvety; lobes spreading, obliquely obovate, overlapping to left, apex apiculate. Stamens inserted in widened portion of corolla tube; anthers free, oblong, base obtuse; disc of 2 glands. Ovaries 2; ovules numerous. Style filiform; pistil head with a cylindric base and reflexed hyaline frill. Follicles 2, cylindric, apex acute. Seeds black, oblong, testa rugose.
Erect annual or perennial herbs. Lvs opposite, with milky latex. Fls axillary, solitary or in pairs, 5-merous. Calyx small, deeply lobed, without basal glands. Corolla salverform; tube narrow, throat closed by hairs; limb patent, twisted anticlockwise in bud. Filaments very short; anthers oblong, connivent into cone around stigma, the base shortly sagittate and connective not spreading. Disc consisting of 2 glands alternating with ovary. Carpels 2; ovules many; style uniformly slender; stigma with thin transparent collar at base. Follicle cylindric, erect or partly so. Seeds 15-30 per follicle, tuberculate; coma 0.
Ovary of two very narrowly oblong carpels; disk composed of two narrowly triangular to narrowly oblong glands, the bases of which touch each other at the abaxial sides of the carpels; style filiform; clavuncula cylindrical, at the base provided with a reflexed hyaline frill; ovules numerous.
Inflorescences terminal, but apparently lateral due to pseudomonopodial continuation of the stem by alternating development of one of the axillary buds of the apical pair of leaves, 1–2-flowered.
Corolla purple, red, pink, or white, hypocrateriform; tube laxly puberulous or glabrous, constricted and woolly to velvety at the throat; lobes spreading, obliquely obovate, spiculate.
Stamens inserted at the widest portion of the corolla-tube (usually above the middle); anthers oblong obtuse at the base.
Leaves herbaceous to thinly coriaceous, opposite, mucronate, with a fringe or intra-and interpetiolar colleters.
Seed black, oblong; testa rugose; hilum lateral; cotyledons flat, shorter than the radicle; endosperm scanty.
Herbs, perennial or annual, often woody at the base, branched to a varying degree.
Sepals narrowly to very narrowly oblong, subulate, eglandular.
Fruit composed of two follicles; follicles cylindrical, acute.
Flowers actinomorphic.
