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Dicotyledonae A class of flowering plants(phylum Angiophyta) characterized by having two cotyledons in the seed. 雙子葉植物綱：顯花植物的一個(gè)綱（隸屬被子植物門），特征是在種子的胚內(nèi)包含兩片子葉。
Angiosperms are divided into two major classes, the monocotyledons (MONOCOTYLEDONAE) and dicotyledons (DICOTYLEDONAE), with a small basal group known as primitive dicotyledons. 被子植物可以劃分為兩個(gè)綱，單子葉植物綱和雙子葉植物綱。