Herbs, usually glandular hairy. Stems erect or reclining, branched. Leaves petiolate, simple, entire. Flowers solitary, axillary, somewhat actinomorphic. Calyx tubular-campanulate, deeply 5-parted. Corolla funnelform or salverform, tube gradually inflated upwards; lobes short, rounded or short pointed. Stamens inserted in corolla tube, included; filaments slender; anthers dehiscing longitudinally; disc glandular, entire or lobed. Ovary 2-locular; stigma indistinctly 2-lobed; ovules numerous. Fruit a dry, 2-valved capsule. Seeds minute, subglobose or ovoid, reticulate-pitted; embryo slightly curved or erect.
the pedicels sturdy, articulating at the base. Flowers minute to large and showy, 5-merous, slightly irregular, calyx campanulate or tubular-salverform, strongly nerved, lobed more than halfway to the base, the lobes sometimes subfoliaceous; corolla salverform, tubiform or funnelform, prefloration induplicate, the limb sinuate-lobed; stamens equal or not, the filaments inserted below the middle of the corolla tube, sometimes geniculate, the anthers included, ovoid, versatile, 4-thecate, dehiscing longitudinally; ovary 2-loculed, the ovules many on axile placentae. Fruit a dry capsule dehiscing septicidally in the apical portion, many- seeded; seeds minute, globose, reniform or prismatic, foveate; embryo straight or slightly curved.
Viscid, unarmed herbs or shrubs. Leaves simple, entire, sessile or rarely petiolate; minor leaves absent. Inflorescence a short raceme with paired, equal bracts, the flowers remote and appearing solitary with paired, equal bracteoles,
"Cal divided to below the middle, the lobes foliaceous, often unequal; cor funnelform to salverform, shallowly 5-lobed; stamens inserted at or below the middle of the cor-tube; anthers ovoid, longitudinally dehiscent; capsule 2-valved, many-seeded; herbs, usually clammy-pubescent; lvs alternate, or falsely opposite on the flowering branches, entire; fls small to large, solitary on short lateral peduncles, violet to red or white. 40, New World."
Stamens 5, ± equal or unequal, often one shorter than the other 4, or didynamous, glabrous, inserted at ± the same level in the corolla tube, commonly in the basal half, included or elsewhere exserted; filaments slender, somewhat expanded towards the base, sometimes geniculate near the insertion; anthers all fertile or elsewhere one of them occasionally sterile, deeply cordate, attached on the lower part of the back or at the base between the ovoid thecae, dehiscing by longitudinal slits.
Disk annular, fleshy, irregularly continuous or laterally sub-bilobed, adnate to and surrounding the basal part of the ovary.
Calyx campanulate or cylindric-salviform, strongly 10-nerved, deeply divided to near the base, the laciniae often ± foliaceous, narrow, oblong-spathulate, with valvate aestivation; in fruit somewhat enlarged, equalling or surpassing it.
Corolla varying in colour from white or pale yellow to deep red-purple or violet to bluish, often variegated, infundibuliform or salviform, occasionally tubular, simple (elsewhere sometimes double); tube long, terete or ventricose, nearly or quite straight, seated loosely in the calyx, the mouth open; limb shorter than the tube, broad, plicate, patent, unequally and sinuately 5-lobed to deeply fringed (in some cultigens elsewhere), the lobes with induplicate aestivation.
Inflorescences consisting of one flower usually arising from a pair of ± equal, foliaceous bracts, but often appearing to be arranged in short, terminal pseudoracemes; pedicel articulated at the base.
Flowers large and showy (elsewhere sometimes minute), somewhat zygomorphic.
Fruit capsular, ovoid, sessile, membranous, 2-locular, with a central placenta ultimately detached, apically dehiscent by 2 often short, septicidal slits, the 2 dry valves entire or 2-fid.
Herbs or occasionally shrubs, erect to sprawling, with varied indumentum, often viscid and glandular-pubescent.
Seeds numerous, minute, scarcely compressed, ± globose, prismatic or reniform; testa somewhat leathery, foveolate-reticulate; embryo ± straight or curved, in the axis of the fleshy endosperm.
Leaves solitary, alternate, the upper ones, near the inflorescence, in pairs and appearing opposite, sessile or shortly petiolate, entire, with glandular hairs; minor leaves absent.
Ovary subsessile, ovoid, 2-locular; ovules numerous in each locule on a placenta adnate to the dorsal line of the dissepiment, anatropous; style slender; stigma minute, capitate, slightly grooved or obsoletely 2-lobed at the tip, included.