Succulent, prostrate or vinelike herbs, often climbing by coiling petioles; annual or perennial. Roots sometimes tuberous. Leaves alternate, digitately angled or peltate, sometimes lobed. Flowers solitary, axillary, very irregular, usually showy. Sepals 5, one produced into a spur. Petals 5, rarely fewer, clawed, the upper 2 unlike the others. Stamens 8, free, unequal. Ovary superior, 3-lobed, 3 celled; cells 1-ovuled. Single genus with about 50 species of Latin Am. (Munz, Flora So. Calif. 845).