Raceme: Difference between revisions
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a receme is a type of inflorescence in which older flower is present at bottom and younger at top.. |
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{{about|the botanical term|mixtures of chiral compounds in chemistry|Racemates}} |
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{{Unreferenced|date=December 2009}} |
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A '''raceme''' ({{IPAc-en|icon|r|eɪ|ˈ|s|i|m}} or {{IPAc-en|r|ə|ˈ|s|i|m}}) is a type of [[inflorescence]] that is unbranched and [[indeterminate growth|indeterminate]] and bears ''pedicellate'' [[flower]]s — flowers having short floral stalks called [[Pedicel (botany)|pedicel]]s — along the axis. In [[botany]], ''axis'' means a shoot, in this case one bearing the flowers. In a ''raceme'', the oldest flowers are borne towards the base and new flowers are produced as the shoot grows. A plant that flowers on a showy raceme may have this reflected in its scientific name, e.g. ''[[Cimicifuga racemosa]]''. |
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A '''spike''' is a type of ''raceme'' in which individual flowers are ''sessile'' (that is, lack pedicels). The term '''[[spikelet]]''' can refer to a small ''spike'', although it is primarily used to refer to the ultimate flower cluster unit in the grasses ([[Poaceae|Family Poaceae]]), in which case the stalk supporting the cluster becomes the ''pedicel''. A true spikelet comprises one or more florets enclosed by two [[glume]]s ([[bract]]s), and is not a raceme. |
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A '''[[spadix]]''' is a form of spike in which the florets are densely crowded along the axis. They are enclosed or accompanied by a highly specialized [[bract]] called a [[spathe]] and are a characteristic of the [[Araceae]] family. |
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==Examples== |
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<gallery perrow="3"> |
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Image:Traube (inflorescence).svg|A raceme |
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Image:Inflorescences Spike Kwiatostan Kłos.svg|A spike |
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Image:Kolben (inflorescence).svg|A spadix |
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Image:Spathoglottis flwrs reduced.jpg|The inflorescence of the [[terrestrial plant|terrestrial]] [[orchid]] '' Spathoglottis plicata'' is a typical raceme. |
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Image:Pycreus.jpg|Each of the units radiating outward in this inflorescence of a ''[[Cyperus]]'' sedge inflorescence is a '''spikelet''' composed of small flowers (florets) arranged in two ranks |
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</gallery> |
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==Derivation== |
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From classical Latin ''racemus'', cluster of grapes. <ref>Oxford English Dictionary. Raceme 2. Bot. A type of inflorescence in which the flowers are arranged on short, nearly equal, lateral pedicels, at equal distances along a single elongated axis </ref> |
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==See also== |
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* [[Inflorescence]] |
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* [[Glossary of botanical terms]] |
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==References== |
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{{Reflist}} |
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[[Category:Plant morphology]] |
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[[ar:عذقة]] |
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[[ca:Raïm (inflorescència)]] |
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[[cs:Hrozen]] |
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[[de:Traube]] |
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[[es:Racimo]] |
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[[eo:Grapolo]] |
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[[fr:Grappe]] |
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[[gl:Acio]] |
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[[hsb:Kić]] |
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[[io:Grapo]] |
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[[is:Smáax]] |
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[[it:Racemo (botanica)]] |
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[[ka:მტევანი]] |
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[[lt:Kekė]] |
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[[nl:Tros (bloeiwijze)]] |
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[[nrm:Trochet]] |
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[[pl:Grono]] |
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[[pt:Racemo]] |
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[[ro:Racem]] |
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[[scn:Grappa]] |
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[[sl:Grozd (socvetje)]] |
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[[sr:Грозд]] |
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[[vec:Rejota]] |
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[[uk:Китиця]] |
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Revision as of 15:49, 29 November 2011
a receme is a type of inflorescence in which older flower is present at bottom and younger at top..