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Inflorescences cymose, few to many-flowered or by reduction occasionally 1-flowered; cymes axillary but often forming terminal leafy panicels at the apices of the stems; bracteoles often small; pedicels usually short.
Annual or perennial, erect or trailing herbs or subshrubs, covered with a conspicuous indumentum of soft stellate hairs on all vegetative parts, peduncles, bracteoles, pedicels and sepals.
Corolla funnel-shaped, purple or violet or white with a purple centre, limb spreading almost entire; midpetaline areas well-defined.
Sepals 5, usually more or less unequal, often ovate or oblong to lanceolate; outer ones often dorsally subcarinate.
Leaves petiolate; lamina usually ovate, oblong to subcordate, entire or coarsely dentate-sinuate.
Stems usually simple or branched upwards, often firm to stout.
Disk annular at the base of the ovary.
Stamens included, unequal in length.
Stigmas bicapitate or oblong.
Pollen spherical spinulose.
Ovary bilocular, 4-ovuled.
Capsule 4-valved.
Seeds 4, hairy.
