Clusters with Pedicellate Flowers.

[Raceme], flowers on pedicels of about equal length, scattered along the entire stem. Locust-tree.

[Corymb], like a raceme except that the lower flowers have longer stems, making the cluster somewhat flat-topped; the outer flowers bloom first. Hawthorn.

[Cyme], in appearance much like a corymb, but it differs in the fact that the central flower blooms first. Alternate-leaved Cornel.

[Umbel], stems of the separate flowers about equal in length, and starting from the same point. Garden-cherry.

[Panicle], a compound raceme. Catalpa.

Thyrsus, a compact panicle. Horse-chestnut.

Clusters with Sessile or Nearly Sessile Flowers.

[Catkin], bracted flowers situated along a slender and usually drooping stem. This variety of cluster is very common on trees. The Willows, Birches, Chestnuts, Oaks, Pines, and many others have their flowers in catkins.

[Head], the flowers in a close, usually rounded cluster. Flowering Dogwood.