Raceme
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A raceme is a type of inflorescence that is unbranched and indeterminate and bears pedicellate flowers — 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 towards the base and new flowers are produced as the shoot grows. A plants that flowers on a showy raceme may telegraph the fact in its scientific name: Cimicifuga racemosa etc.
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 is also used to refer to the ultimate flower cluster unit in the grasses (Family Poaceae) and sedges (Family Cyperaceae), in which case the stalk supporting the cluster becomes the pedicel.
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A spadix is a form of spike in which the florets are densely crowded along the axis.de:Traube eo:Grapolo nl:Tros (bloeiwijze)