Cotyledon (seed leaf) the first leaf of the embryo of seed plants, which is usually simpler in structure than later-formed leaves.
Cotyledon (seed leaf) the first leaf of the embryo of seed plants, which is usually simpler in structure than later-formed leaves.
子叶：种子植物胚胎的第一片叶，在结构上通常比后来形成的叶简单。