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Corolla tube usually narrow at base, of ten much enlarged above and towards throat, incurved or slightly incurved; lobes 5, erect-spreading, flat, entire or undulate-crisped on margin.
Flowers usually large, solitary-axillary or in terminal spikes or racemes, sessile or pedicellate, bibracteolate or ebracteolate.
Capsule ovoid, ellipsoid or subspherical, somewhat compressed, loculicidal.
Calyx tubular or tubular-campanulate, 5-dentate or 5-lobed to below middle.
Leaves opposite or alternate usually at least the lower reduced to scales.
Parasitic herbs, erect or ascending, usually glandular-hairy.
Seeds numerous, oblong in outline, truncate.
Stigma clavate or oblong, tongue-shaped.
Style incurved.