Pinnate - Revision history

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2009-04-17T14:38:00Z

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2009-04-14T01:17:12Z

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Raffi at 06:47, 28 March 2007

2007-03-28T06:47:35Z

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{{Wiktionary}}
'''Pinnate''' is a term used to describe [[feather]]-like or multi-divided features arising from both sides of a common axis in [[plant]] or [[animal]] structures, and comes from the [[Latin]] word ''pinna'' for "feather". A similar term is '''''pectinate''''', which refers to a [[comb]]-like arrangement of parts (arising from one side of an axis). The term contrasts somewhat with '''''[[leaf shape|palmate]]''''', in which the parts or structures radiate out from a common point.

[[image:fern_frond_pinnate.jpg|right|thumb|200px|A '''pinnate''' frond of the fern, ''Blechnum appendiculatum''.]]
Botanically, the term describes an arrangement of discrete structures (such as leaflets, veins, lobes, branches, or appendages) arising at multiple points along a common axis. For example, once-divided leaf blades having leaflets arranged on both sides of a ''rachis'' are '''''pinnately compound''''' leaves. Many [[Palm tree|palm]]s (notably the [[feather palm]]s) and most [[cycad]]s and [[grevillea]]s have pinnately divided leaves. Most species of [[fern]]s have pinnate or more highly divided [[frond]]s, and ferns the leaflets are typically referred to as "pinnae" (singular "pinna"). Plants with pinnate leaves are sometimes colloquially called "feather-leaved".

'''pinnatifid''' – leaves with pinnate lobes that are not discrete, remaining sufficiently connected to each other that they are not separate leaflets.

'''paripinnate''' – pinnately-compound leaves in which leaflets are born in pairs along the rachis without a single terminal leaflet; also called "even-pinnate".

'''imparipinnate''' – pinnately-compound leaves in which there is a lone terminal leaflet rather than a terminal pair of leaflets; also called "odd-pinnate".

'''bipinnate''' – pinnately-compound leaves in which the leaflets are themselves pinnately-compound; also called "twice-pinnate".

'''tripinnate''' – pinnately-compound leaves in which the leaflets are themselves bipinnate; also called "thrice-pinnate".

'''tetrapinnate''' – pinnately-compound leaves in which the leaflets are themselves tripinnate.

[[Category:Plant morphology]]

@@ Line 12: / Line 12: @@
 '''bipinnate'''
-'''tripinnate'''
+'''tripinnate''' - Three times [[pinnate]].{{SCH}}
 '''tetrapinnate'''
 {{glossary}}

@@ Line 1: / Line 1: @@
-{{Wiktionary}}
+[[image:fern_frond_pinnate.jpg|right|thumb|200px|A '''pinnate''' frond of the fern, ''Blechnum appendiculatum''.]]
-'''Pinnate''' is a term used to describe [[feather]]-like or multi-divided features arising from both sides of a common axis in [[plant]] or [[animal]] structures, and comes from the [[Latin]] word ''pinna'' for "feather". A similar term is '''''pectinate''''', which refers to a [[comb]]-like arrangement of parts (arising from one side of an axis). The term contrasts somewhat  with '''''[[leaf shape|palmate]]''''', in which the parts or structures radiate out from a common point.
+Feather-like; with the [[leaflet]]s of a compound [[leaf]] placed on either side of the [[rachis]].{{SCH}}
-[[image:fern_frond_pinnate.jpg|right|thumb|200px|A '''pinnate''' frond of the fern, ''Blechnum appendiculatum''.]]
+Types:
-'''pinnatifid''' &ndash; leaves with pinnate lobes that are not discrete, remaining sufficiently connected to each other that they are not separate leaflets.
+'''pinnatifid'''
-'''paripinnate''' &ndash; pinnately-compound leaves in which leaflets are born in pairs along the rachis without a single terminal leaflet; also called "even-pinnate".
+'''paripinnate'''
-'''imparipinnate''' &ndash; pinnately-compound leaves in which there is a lone terminal leaflet rather than a terminal pair of leaflets; also called "odd-pinnate".
+'''imparipinnate'''
-'''bipinnate''' &ndash; pinnately-compound leaves in which the leaflets are themselves pinnately-compound; also called "twice-pinnate".
+'''bipinnate'''
-'''tripinnate''' &ndash; pinnately-compound leaves in which the leaflets are themselves bipinnate; also called "thrice-pinnate".
+'''tripinnate'''
-'''tetrapinnate''' &ndash; pinnately-compound leaves in which the leaflets are themselves tripinnate.
+'''tetrapinnate'''
-[[Category:Plant morphology]]
+{{glossary}}