Araceme (/reɪˈsiːm,rə-/) orracemoid is an unbranched,indeterminate type ofinflorescence bearing flowers having short floral stalks along the shoots that bear the flowers. The oldest flowers grow close to the base and new flowers are produced as the shoot grows in height, with no predetermined growth limit. Examples of racemes occur on mustard (genusBrassica), radish (genusRaphanus), and orchid (genusPhalaenopsis) plants.
Araceme orracemoid is an unbranched,indeterminate type ofinflorescence bearing pedicellateflowers (flowers having short floral stalks calledpedicels) along its axis.[1] Inbotany, anaxis means a shoot, in this case one bearing the flowers. In indeterminate inflorescence-like racemes, the oldest flowers grow close to the base and new flowers are produced as the shoot grows in height, with no predetermined growth limit.[2] A plant that flowers on a showy raceme may have this reflected in its scientific name, e.g. thespeciesActaea racemosa. A compound raceme, also called apanicle, has a branching main axis. Examples of racemes occur on mustard (genusBrassica) and radish (genusRaphanus) plants.[3]
Aspike is an unbranched, indeterminate inflorescence, similar to a raceme, but bearing sessile flowers (sessile flowers are attached directly, without stalks).[2] Examples occur on Malabar nut (Justicia adhatoda) and chaff flowers (genusAchyranthes).[3] Aspikelet can refer to a small spike, although it primarily refers to the ultimate flower cluster unit in grasses (family Poaceae) and sedges (familyCyperaceae),[2] in which case the stalk supporting the cluster becomes the pedicel. A true spikelet comprises one or more florets enclosed by twoglumes (sterilebracts), with flowers and glumes arranged in two opposite rows along the spikelet. Examples occur on rice (speciesOryza sativa) and wheat (genusTriticum), both grasses.[3]
Anament orcatkin is very similar to a spike or raceme "but with subtending bracts so conspicuous as to conceal the flowers until pollination, as in thepussy–willow,alder, [and]birch...". These are sometimes calledamentaceous plants.[4]
Aspadix is a form of spike in which the florets are densely crowded along a fleshy axis and enclosed by one or more large, brightly–coloredbracts calledspathes. Usually the female flowers grow at the base, and male flowers grow above.[3] They are a characteristic of the familyAraceae, for example jack–in–the–pulpit (speciesArisaema triphyllum) and wild calla (genusCalla).[4]
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From classical Latin, aracemus is acluster of grapes.[5]
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