The hypocotyl usually elongates, by its cells increasing very greatly in the longitudinal direction both in number and size, so that the cotyledons are raised into the air as the first foliage-leaves.
Friedrich Rochleder has described as constituent principles of the cotyledons aphrodaescin, C52H82023, a bitter glucoside, argyraescin, C27 H 42012, aescinic acid, C21H40012, and queraescitrin, C41 H 46025, found also in the leaves.
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