The bulb is an underground vertical shoot that has modified leaves (or thickened leaf bases) that come utilized when food storage organs by a dormant plant. More types of storage organs (like corms, rhizomes, and tubers) are another time mistakenly known as bulbs. The correct term for plants that form underground storage organs, including bulbs besides when tubers and corms, is geophyte.

The bulb's leaf bases usually don't trend lines leaves, however contain food reserves to enable a plant to hold out adverse conditions. A leaf bases might overlap & surround a center of a bulb when using lilies, or even can wholly surround a inner regions of the bulb, when by using the onion. The limited stem forms the base of the bulb, & plant incubation occurs from either this basal plate. Roots emerge from a bottom of the base, & freshly stems and leaves from the upper side.

Plants that form true bulbs come everthing monocotyledons, and include: Onion, garlic, and more alliums, family Alliaceae. Lily, tulip, and numerous more members of the family liliaceae Liliaceae. Amaryllis, Hippeastrum, Narcissus, and more members of the amaryllidaceae Amaryllidaceae. Some coinage of Iris, family Iridaceae.

A bit of epiphytic orchids (family Orchidaceae) form bulb-like, above-ground storage organs known as pseudobulbs.

Occasionally lilies form little bulbs known as bulblet in their leaf axils. Many members of the onion personal, Alliaceae, including Allium sativum (garlic), form bulbils in their flower heads, for instance when a flowers fade, or instead of the flowers. A and so-alleged "Tree Onion" (Allium cepa volt-ampere. proliferum) forms little onions which are then big plenty for pickling.

de:Zwiebel (Pflanzenteil) es:Bulbo (botánica) eo:Bulbo he:בצל nl:bol