Aristolochia nummulariifolia Kunth

Herbs, 3 to 6 dm. tall, perennial, with thickened fusiform roots. Leaves alter-nate, somewhat distichous, reniform to acute and cordate, ca. 3 cm. broad, 2 to 3 cm. long, glabrous. Pseudostipules absent. Flowers small, axillary, rectilinear, the utricle, tube and monolobate limb nearly indistinguishable as such, ca. 2 to 4 cm. long, greenish yellow. Fruit cylindric, ca. 2 cm. long, 1 cm. wide, dehiscing acropetally. Seeds numerous, horizontally compressed, 2 mm. wide, 0.2 mm. thick.