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苹，学名 Ｍａｒｓｉｌｅａ ｑｕａｄｒｉｆｏｌｉａ Ｌ，为苹科多年生水生草本植物。根状茎细长，横生走，分枝，顶端有淡棕色毛，茎节远离，向上发一到数叶。叶柄细长，长 ５～ ２５ｃｍ，叶片由 ４枚倒三角形的小叶组成，呈十字形，绿色，草质无毛。叶柄基部生有单一或分叉
Apple, scientific name Marsilea quadrifolia L, is a perennial aquatic herbaceous plant. Rhizomes slender, transverse walk, branches, light brown hair at the top, stalks away, hair up to the number of leaves. Petiole slender, long 5 ~ 25cm, leaves from 4 inverted triangular leaflets, was cruciform, green, grassy glabrous. Petiole base with a single or bifurcation