An inflorescence (PO:0009049), with a monopodial growth habit, which at anthesis is composed of sessile (PATO:0001436) flowers (PO:0009046) on an indeterminate first order inflorescence axis (PO:0025104).
The basal-most flowers of some spike inflorescences have short inflorescence flower pedicels (PO:0009052), such as in ladies'-tresses orchids (Spiranthes; Orchidaceae). Examples include black pepper (Piper nigrum; Piperaceae).
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