This curve resembles the unifoliate hyperbola in maths. 该曲线像数学中的单叶双曲线。
Leaves unifoliate, leaflet elliptic or ovate, acute or acuminate. 花单生或数枚生叶腋；花小，花瓣白色5枚，向外开展；
Unifoliate, edge bine each other is unripe, certain planted foliaceous opposite or verticillate. 单叶,沿茎互生,某些种的叶对生或轮生。
Unifoliate each other is unripe, form of upside leaf egg, form of bottom leaf spoon, the brim has thick toothed. 单叶互生,上部叶卵形,下部叶匙形,边缘有粗锯齿。
Foliaceous opposite or verticillate, rare each other is unripe, unifoliate, without stipule. 叶对生或轮生,稀互生,单叶,无托叶。
Unifoliate opposite, rare 3 impeller are unripe, whole reason or have be short of crack, 3-5 of palm shape arteries and veins, armpit of arteries and veins often has gland spot below the leaf. 单叶对生,稀3叶轮生,全缘或有缺裂,掌状脉3-5,叶下面脉腋常具腺斑。
