Shrubby climbers with pinnate deciduous often tendrilled leaves and handsome campanulate flowers. Calyx entire or obscurely toothed. Corolla slightly irregular. Fertile stamens 4, with a rudiment of a fifth. Capsule 2-celled, 2-valved, compressed, the partition parallel with the valves. This genus commemorates the Abbe Bignon, librarian to Louis XIV.

1. B. capreolata. - A very handsome glabrous climber with unijugate leaves terminating in a branched tendril, and often provided with two very small leaflets near the base of the petiole. Peduncles clustered, one-flowered. Flowers large, orange. A native of North America from Virginia southwards, and only suitable for warm sheltered situations.