This MedLibrary.org supplementary page on Woody plant is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:
Related Sponsors
A woody plant is any vascular plant that has a perennial stem that is above ground and covered by a layer of thickened bark. Woody plants are adapted to survive from one year to the next; the stem supports continued vegetative growth above ground from one year to next.
A perennial plant with true woody stems contain wood, which is primarily composed of structures of cellulose and lignin which provide support and a vascular system used to move water and nutrients from the roots to the leaves and sugars from the leaves to the rest of the plant. Most woody plants form new layers of woody tissue each year, and so increase their stem diameter from year to year. The new wood is deposited on the outer parts of the stem under the bark on most plants but in some monocotyledons such as palms and dracaenas, the wood is formed in bundles from meristem cells within the trunk.1 In palms, the wood is formed in the center of the stems. The dermal layer has been modified to protect the stems from the elements with a thickened covering of dead tissue, generally called bark.
Woody plants are usually either trees, shrubs, or lianas.
Some annual plants appear to form woody stems in their first year, but die at the end of the growing season. They are herbaceous stems without the dead bark covering.
Woody herbs are herbaceous plants that do not have the thickened bark covering, but develop hard stems with vascular bundles. They include such plants as Uraria picta and certain species in family Polygonaceae. These herbs are not truly woody but have hard densely packed stem tissue. Other herbaceous plants have woody stems called a caudex, which is a thickened stem base often found in plants that grow in alpine or dry environments.
The symbol for a woody plant, based on Species Plantarum by Linnaeus is, 
, which is also the astronomical symbol for the planet Saturn.2
See also
References
- ^ Monocot relationships: an overview - Chase 91 (10): 1645 - American Journal of Botany
- ^ Stearn, William T. "Botanical Latin" (four editions, 1966-92)
 |
This botany article is a stub. You can help Wikipedia by expanding it. |
Wikipedia content modification information:
- This page was last modified on 4 December 2008, at 11:19.
Wikipedia Authorship and Review
Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.
Wikipedia Usage Guidelines
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Woody plant".
The URL for this specific entry is:
All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.