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A raceme is a type of inflorescence that is unbranched and indeterminate and bears pedicellate flowers (having short floral stalks called 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 near the base.
A spike is a type of raceme in which the individual flowers are sessile (that is, lack pedicels). The term spikelet can refer to a small spike, although is also used to refer to the ultimate flower cluster unit in the grasses ( Family Poaceae) and sedges ( Family Cyperaceae), in which cases the stalk supporting the cluster becomes the pedicel.
A spadix is a form of spike in which the florets are densely crowded along the axis.
Botany