Inflorescences can be single or multi-flowered and the flowers can be stalkless (sessile) or carried on a stalk (pedicel) of varying length.
Spike: multi-flowered undivided inflorescence with the flowers either stalkless (sessile) or on very short hardly discernible stalks (subsessile).
Raceme: multi-flowered undivided inflorescence with the flowers distinctly stalked.
Panicle: a multi-flowered branched inflorescence.
Condensed head: a specialised inflorescence with all parts greatly condensed, the flowers stalkless and surrounded by rows of bracts (capitulum).
Umbel: an inflorescence with the flower stalks arising from the same point: this arrangement usually results in the flowers radiating from the end of the inflorescence stalk.
Single flower: an inflorescence of this type bears a single flower. An inflorescence stalk (peduncle) can be present but is often reduced to a small basal part.