Zoology: General

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pulvinus

A Dictionary of Biology | 2004 | Copyright

pulvinus A group of cells at the base of a leaf or leaflet in certain plants that, by rapidly losing water, brings about changes in the position of the leaves. In the sensitive plant (Mimosa pudica), the pulvinus is responsible for the folding of the leaves that occurs at nightfall or when the plant is touched or injured. See motor cell.

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pulvinus

A Dictionary of Plant Sciences | 1998 | | Copyright

pulvinus
1. A swelling at the base of a petiole or pinna, made up of cells that are capable of moving water in and out of their vacuoles quickly, resulting in movement of the petiole or pinna.

2. A thickened region at the node of a grass stem, often containing an intercalary meristem, which can raise the culm after lodging.

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MICHAEL ALLABY. "pulvinus." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "pulvinus." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O7-pulvinus.html

MICHAEL ALLABY. "pulvinus." A Dictionary of Plant Sciences. 1998. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-pulvinus.html

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pulvinus

A Dictionary of Zoology | 1999 | | Copyright

pulvinus In insects, a spongy pad between the front of the head and the mouth.

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MICHAEL ALLABY. "pulvinus." A Dictionary of Zoology. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "pulvinus." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O8-pulvinus.html

MICHAEL ALLABY. "pulvinus." A Dictionary of Zoology. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-pulvinus.html

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Free newspaper and magazine articles

	Heat retention and herbivory benefits of the pulvinus organ. (Biology Poster... Magazine article from: Journal of the Idaho Academy of Science; 6/1/2001
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