Panicle

A panicle is a much-branched inflorescence.[1] Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a panicle are often racemes. A panicle may have determinate or indeterminate growth.

Diagram of a panicle

This type of inflorescence is largely characteristic of grasses such as oat and crabgrass,[lower-alpha 1] as well as other plants such as pistachio and mamoncillo. Botanists use the term paniculate in two ways: "having a true panicle inflorescence"[lower-alpha 2] as well as "having an inflorescence with the form but not necessarily the structure of a panicle".

Corymb

A corymb may have a paniculate branching structure, with the lower flowers having longer pedicels than the upper, thus giving a flattish top superficially resembling an umbel. Many species in the subfamily Amygdaloideae, such as hawthorns and rowans, produce their flowers in corymbs.

Sorbus glabrescens corymb with fruit

See also
  • Thyrse, a branched inflorescence where the main axis has indeterminate growth, and the branches have determinate growth

Notes
  1. Technically, the inflorescence unit in a grass is the spikelet, but the arrangement of spikelets may be described as a panicle.
  2. "In the form of a panicle"[1]

References
  1. Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press. p. 30. ISBN 978-0521790802. A much-branched inflorescence. (softcover ISBN 978-0521794015).
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