Calyx campanulate, puberulent, with margins almost entire. It forms solitary blue or purple campanulate flowers. It produces large, campanulate, yellow flowers. The corms are small, campanulate to triangular in outline, and flat-based. The petioles grow erect and have campanulate, pendant flowers. The calyx is campanulate and shallowly two-lipped. Most have a large, open campanulate to funnel-form corolla adapted to nocturnal bat pollination. The corolla is urceolate when young but becomes more or less campanulate with advancing age. Calyx is campanulate or cup-shaped, densely pubescent. Head involucres are campanulate to cylindric or attenuate. The calyx is 5-dentate and campanulate to cupular. Sepals 5, gamosepalous, campanulate, slightly accrescent, persistent, valvate. The fruits that form later are pedicellate and cupular to campanulate. As the specific epithet suggests, these are campanulate or bell-shaped. The corolla is campanulate and pubescent with five dark violet-blue or purplish-blue petals.