Cotyledon

**Definition:** A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. In seeds without an endosperm, they store food which is used in germination. In some plants, they emerge above the soil surface and become the first photosynthetic leaves. (From Concise Dictionary of Biology, 1990)

**Tree numbers:** - A18.024.500.750.333 - A18.024.875.500

**Synonyms:** - Cotyledons - Seed Leaf - Seed Leaves