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Raceme
A '''raceme''' is a type of inflorescence that is unbranched and indeterminate growth|indeterminate and bears ''pedicellate'' flowers — flowers having short floral stalks called Pedicel (botany)|pedicels — 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 telegraph the fact in its scientific name, e.g. ''Cimicifuga racemosa''.
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 spikelet comprises one or more florets enclosed by two glumes (bracts), and is not a raceme.
A '''spadix''' is a form of spike in which the florets are densely crowded along the axis.
Category:plant morphology
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