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A panicle is a compound raceme, a loose, much-branched indeterminate inflorescence with pedicellate flowers (and fruit) attached along the secondary branches (in other words, a branched cluster of flowers in which the branches are racemes). This type of inflorescence is largely characteristic of grasses like oat and crabgrass Note: technically, the inflorescence unit in a grass is the spikelet, but the arrangement of spikelets along the main stem axis is described using inflorescence terminology. A corymb is similar to a panicle with the same branching structure, but with the lower flowers having longer stems, thus giving a flattish top superficially resembling an umbel. Many species in the Maloideae, such as hawthorns and rowans, produce their flowers in corymbs. A thyrse is a compact panicle having an obscured main axis and cymose subaxes, making its paniculate nature hard to discern. Many Ceanothus species have thrysiform inflorescences, notably Ceanothus thyrsiflorus.
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