Very sparingly hairy. Stem very slender, leaves digitately 5-foliolate; leaflets membranous, broadly or narrowly ovate-oblong, acute, obtusely serrate-toothed, the teeth apiculate, obliquely truncate or subcordate at the base, minutely papillose when dry. Tendrils very slender, 2-fid. Male fl.: Numerous, irregularly subpaniculate or racemed on very slender ebracteate pedicels 1–2 in.; pedicels long and slender the lowest sometimes minutely bracteolate at the base. Calyx-tube broadly campanulate, oblique, deflexed, gibbous at the base; lobes ovate-subulate, spreading, tips filiform, the lower large. Corolla obliquely rotate, yellow, 1 1/2 in. diameter, lobes acuminate. Anther-cells nearly straight, connective narrow; a small hairy staminode placed between the two (2-celled?) anthers. Female fl.: Peduncle short with a minute bract towards the base. Ovary fusiform, muricate, beaked. Fruit (from Kirk's drawing) ovoid, beaked, 2 in. long, covered with large triangular compressed prominences, glaucous-green.
