Descripción: Plantas trepadoras o lianas con las ramitas cuadrangulares y acostilladas. Hojas bipinnadas y opuestas, a veces con un zarcillo trífido. Folíolos de 3-16 x 1.5-10 cm, ovados o elípticos, con ápice agudo o acuminado, bordes enteros y base redondeada. Las hojas presentan tricomas simples, principalmente en las axilas de las nervaduras del envés. Pecíolo y peciólulos fuertemente angulados. Pseudo-estípulas angostas y deciduas. Flores amarillas. Frutos en cápsulas, de 15-30 x 1.5-2.7 cm, con la superficie exterior lepidota y áspera al tacto.

Especies Parecidas: A menudo se confunde con LK amp3pa Amphilophium paniculatum LK2 y LK amp3cr Amphilophium crucigerum LK2 , pero en A. paniculatum y A. crucigerum las hojas son bifolioladas o a veces trifolioladas. También se puede confundir con LK cal5la Callichlamys latifolia LK2 , pero en C. latifolia las ramitas son cilíndricas y las hojas son bifoliadas o trifolioladas.

Liana, glabrous except for pubescence on leaflet midribs and veins below and pilose on axils near base of leaflet below; young stems square; tendrils long, trifid near apex; pseudostipules long, forked. Leaves 3-ternate, or 2-ternate with a tendril or tendril scar; petioles 2.1-6.7 cm long; terminal petiolules 1.2-6.5 cm long; leaflets ovate to elliptic, sometimes falcate, acurninate, obtuse to rounded and sometimes inequilateral at base, 5-15 (16) cm long, 2.5-8.5 (9.5) cm wide, weakly viscid when dried, usually with a few, round, scattered glands. Racemes short, terminal, on short lateral branches; pedicels to 1.5 cm long; calyx campanulate, 6-9 mm long, truncate, minutely toothed; corolla 7-10 cm long, pale yellow throughout or with the lobes white, the tube moderately slender with a few large glands at apex, pubescent inside just below point of starninal attachment, the lobes pubescent and glandular with a few scattered larger glands; stamens included, the longer pair 2.6-2.8 cm long, slightly shorter than style, the shorter pair 1.7-1.9 cm long, the thecae divaricate, to 5 mm long; staminodium 4-5 mm long, inserted ca 2 cm from base of corolla tube. Capsules linear-oblong, acurninate at both ends, to 22 (30) cm long and 2.8 cm wide, glabrous, viscid at least on drying; seeds ca 1.2 cm long and 3.7 (5) cm wide, the lateral margins +/- rounded, the wings +/- opaque. Croat 7876, 7997a. The only bignoniaceous vine with bicompound leaves. Costa Rica to Venezuela; Trinidad. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, San Blas, Los Santos-, Panama, and Darien and from premontane wet forest and tropical wet forest in Panama and Darién;