Descripción: Plantas trepadoras o lianas con las ramitas ligeramente cubiertas de pelos y terminando en un zarcillo. Hojas simples y alternas, de 4-10 x 2-6 cm, ovadas o elípticas, con ápice agudo o acuminado, bordes dentados o crenados y base redondeada o cordada. Estípulas persistentes o deciduas. Pecíolo de 0.5-2.5 cm de largo. Inflorescencias axilares o terminales. Flores blancas y aromáticas. Frutos alados, de 0.6-1 x 0.8-1.2 cm, verdes y con las alas usualmente más anchas que altas.
Especies Parecidas: A menudo se confunde con LK gouaad Gouania adenophera LK2 , pero en G. adenophera las hojas son de mayor tamaño. También se puede confundir con LK gouapo Gouania polygama LK2 , pero en G. polygama las hojas son de mayor tamaño, y las ramitas se encuentran cubiertas de pelos ferruginosos.
Jaboncillo The cuplike disk may become partly filled with a sweet watery nectar, especially while the anthers are shedding pollen. The nectar appears to be absent when the style is receptive. The species is represented on BCI by two distinct races. The less common of the two is characterized by dense reddish-brown pubescence all over but especially on the stems, the lower leaf surfaces, and the seminiferous areas of the fruit. Examples of the more pubescent form include Croat 7274, 7984,12699,12739,13482, Shattuck 290, 444, 523, and Woodworth & Vestal 326. Although the difference between the two races is striking on BCI, variation of G. lupuloides throughout Panama is so great that they cannot be recognized at any higher taxonomic level. Apparently identical collections made in Mexico and Brazil have been identified as G. tomentosa Jacq. and G. mollis (L.) Urban. Further monographic work with Gouania may well prove that these two BCI variants should be considered distinct at the varietal or even the specific level.