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Corolla 5-lobed; tube much longer than calyx, narrow at base widening into long throat; lobes subequal, flat, rounded.
Capsule ovoid-conical, acute or sub-acute to broadly ovoid-cylindrical, obtuse or emarginate, subcompressed.
Prostrate, erect or suberect, or densely tufted undershrubs or woody herbs with long tap-roots.
Flowers solitary, axillary or short axillary cymose, sessile to subsessile, bibracteolate.
Calyx 5-lobed; lobes linear to ovate; tube campanulate.
Seeds small, numerous, obovoid or compressed globose.
Leaves alternate, often crowded, entire, 1-nerved.
Ovary bilocular with several to many ovules.
Style long, filiform.
