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

• Sheath grass belongs to the genus Coleanthus in the sweet grass family
• 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).