Fr a columnar, unarmed, 4-locellar capsule, dehiscent only at the summit; cal 5-cleft, nearly regular; cor campanulate, the limb oblique, the lower lobes the larger; stamens 4, straight, with parallel pollen-sacs; herbs with solitary, axillary fls, the upper lvs generally alternate. 20, Africa and India.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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