Inflorescence rachis

The flowers are arranged on an elongate central axis (rachis) or appear to arise from a single point. An inflorescence comprising a single flower is not elongate and flowers arising in clusters from the axils of leafy bracts (e.g. Cytisus) are similarly treated when the bracts are difficult to distinguish from leaves.

Return to Character index


The central axis is elongate, with flowers (or groups of flowers) arising at intervals along its length (e.g. a raceme, spike, corymb or panicle).

Not elongate

The rachis is not visible, or very much reduced such that flowers appear to arise from a single point (e.g. an umbel or head).