L. H. Bailey,
Beginners' botany
(1921)
“ It is a branching raceme. Because of the earlier growth of the lower branches, the panicle is usually broadest at the base or conical in outline. True panicles are not very common.When an indeterminate flower-cluster is short, so that [159] the top is convex or flat, it is a corymb (Fig. 217) . The outermost flowers open first. Centripetal flower-clusters are sometimes said to be corymbose in mode.When the branches of an indeterminate cluster arise from a common point, like the frame of an umbrella, the cluster is an umbel (Fig. 218) . ”
