Perennial, glabrous. Stem slender, branched. Leaves trifoliate, petiolate, 5-8 cm long; leaflets 2 cm long. Involucre of 1-3 linear bracts. Rays 4-5. Involucel of white margined, linear bractlets. Fruit ovoid to suborbicular, 2.5 mm broad, glabrous; ridges thin.