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非洲豆薯(S.stenocarpa)属多年生攀缘植物,在尼日利亚(Nigeria)被作为一种一年生作物栽培.高三米多,分枝量大,多萌生于叶腋,叶互生;蝶形花科,总状花序,花轴长3～20cm不等;座果率低,花粉红色至紫兰色,旗瓣微螺旋状,呈反褶,雄蕊二枚,柱头匙形;果荚长而无毛,每个果荚长达30cm,种子25粒左右,椭圆形,种皮光滑,颜色有褐棕色斑点、白色和纯黑色几种,到成熟期每一花序有4～10个果荚.
S. tertenocarpa is a perennial climber that was cultivated as an annual crop in Nigeria with a height of more than three meters and a large amount of branching, adventitiously growing in leaf axils and leaves alternate. Papilionaceae, Inflorescence, flower axis length 3 ~ 20cm range; low fruit rate, flower pink to purple, petals micro-spiral, was anti-fold, two stamens, stigma spatulate; pods long and glabrous, each Pods up to 30cm, about 25 seeds, oval, smooth seed coat, brown spots brown color, white and black several, to each mature inflorescence 4 to 10 pods.