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Bulb

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Title: Bulb  
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Subject: Leaf, Garlic, Allium aflatunense, Amaryllis, Galanthus
Collection: Botanical Nomenclature, Energy Storage, Flowers, Garden Plants, Plant Morphology, Plant Reproduction
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Bulb

Shallot bulbs
Hippeastrum (amaryllis) bulb

In ornamental bulbous plants" or just "bulbs".)

A bulb's leaf bases, also known as scales, generally do not support leaves, but contain food reserves to enable the plant to survive adverse weather conditions. At the center of the bulb is a vegetative growing point or an unexpanded flowering shoot. The base is formed by a stem, and plant growth occurs from this basal plate. Roots emerge from the underside of the base, and new stems and leaves from the upper side. Tunicate bulbs have dry, membranous outer scales that protect the continuous lamina of fleshy scales.[2] Species in the genera Allium, Hippeastrum, Narcissus, and Tulipa all have tunicate bulbs. Non-tunicate bulbs, such as Lilium and Fritillaria species, lack the protective tunic and have looser scales.[3]

Longitudinal section through bulb
Cross section of onion bulb

Other types of storage organs (such as pseudobulbs, that superficially resemble bulbs.

Nearly all plants that form true bulbs are monocotyledons, and include:

Oxalis, in the family Oxalidaceae, is the only dicotyledon genus that produces true bulbs.[4][5]

Bulbous plant species cycle through vegetative and reproductive growth stages; the bulb grows to flowering size during the vegetative stage and the plant flowers during the reproductive stage. Certain environmental conditions are needed to trigger the transition from one stage to the next, such as the shift from a cold winter to spring.[2] Once the flowering period is over, the plant enters a foliage period of about six weeks during which time the plant absorbs nutrients from the soil and energy from the sun for setting flowers for the next year. Bulbs dug up before the foliage period is completed will not bloom the following year but then should flower normally in subsequent years.

After the foliage period is completed, bulbs may be dug up for replanting elsewhere. Any surface moisture should be dried, then the bulbs may be stored up to about 4 months for a fall planting. Storing them much longer than that may cause the bulbs to dry out inside and become nonviable.

Contents

  • Bulbil 1
  • Further reading 2
  • References 3
  • External links 4

Bulbil

A bulbil is a small bulb, and may also be called a bulblet, bulbet, or bulbel.[6]

Small bulbs can develop that replace or propagate a large bulb. If one or several moderate-sized bulbs form to replace the original bulb, they are called renewal bulbs.[6] Increase bulbs are small bulbs that develop either on each of the leaves inside a bulb, or else on the end of small underground stems connected to the original bulb.[6]

Some lilies form small bulbs, called bulbils, in their leaf axils. Several members of the onion family, Alliaceae, including Allium sativum (garlic), form bulbils in their flower heads, sometimes as the flowers fade, or even instead of the flowers. The so-called tree onion (Allium cepa var. proliferum) forms small onions which are large enough for pickling.

Some ferns, such as Hen and Chicken Fern produce new plants at the tips of the fronds' pinnae, which are sometimes referred to a bulbils.

Further reading

  • Coccoris, Patricia (2012) The Curious History of the Bulb Vase. Published by Cortex Design.

References

  1. ^ Bell, A.D. 1997. Plant form: an illustrated guide to flowering plant morphology. Oxford University Press, Oxford, U.K.
  2. ^ a b Mishra, S.R. (2005). Plant Reproduction. Discovery Publishing House. pp. 120–125.  
  3. ^ Ellis, Barbara W. (2001). Bulbs. Houghton Mifflin Harcourt. p. 3.  
  4. ^ Hartmann, Hudson Thomas; Dale E. Kester (2002). Hartmann and Kester's Plant Propagation: Principles and Practices (7 ed.). Prentice Hall. p. 561.  
  5. ^ Oberlander, K. C.; Emshwiller, E.; Bellstedt, D.U. & Dreyer, L.L. (2009). "A model of bulb evolution in the eudicot genus Oxalis (Oxalidaceae)". Molecular phylogenetics and evolution 51 (1): 54–63.  
  6. ^ a b c Bell, A.D. (1997). Plant form: an illustrated guide to flowering plant morphology. Oxford, U.K.: Oxford University Press. 

External links

  • Bulb Care and Selection from the New York Botanical Garden
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