P. nictagynaflora has large white flowers, coarser in its growth than the last, but of the same spreading habit.
From these two species have been produced innumerable improved varieties, which can be perpetuated only by cuttings or layers, and kept in the green-house through the winter. Seedlings will vary essentially from the parent plant.
These varieties are various shades of white, rose or light-purple, beautifully veined, striped or shaded with crimson or purple, with dark throats.
Single plants should be trained to a trellis or frame-work, and will grow three or four feet high. Planted in masses, they present an ever-blooming, beautiful sight. The plants are repulsive to the smell, and unpleasant to the touch, as the stems and leaves are covered with a viscid substance.