Parts of an Onion

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basal plate - especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem

bulb - a plant underground resting stage consisting of a short stem base bearing one or more buds enclosed in thickened storage leaves

immature flower - a stage of early development

scale leaf - a specialized leaf or bract that protects a bud or catkin

root - the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground

tunic - an enveloping or covering membrane