Plants such as lilac and oats have an inflorescence similar to a raceme, but the pedicels bear more than one flower. This formation is called a panicle.
In the corymb, the pedicels are of unequal length so that the inflorescence has a flat-topped appearance, for example hawthorn. In some plants, particularly those of the family Compositae, all the flowers are bunched on a flat disk, this arrangement being known as a head.
In the simple umbel the pedicels appear to arise from a central point, while in the compound umbel several simple umbels are borne on a single stalk or ray and each inflorescence comprises a number of rays growing from the tip of the main axis. A simple umbel is produced by the milkweed and most members of the carrot family (Umbelliferae) produce compound umbels.
Related category• BOTANY
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