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Antheridia in the ventricose bases of spicate leaves.

Spiraea.—Vigorous growing plants of great beauty, preferring good, deep, rather moist soil; the flowers small but very abundant, in large corymbose or spicate panicles.

The yellow flowers are produced on spicate racemes, while the leaves are alternate, smooth and spear-shaped.

The spikelets are all unisexual, spicate, the male and female spikelets are dissimilar, and are on the same or on different spikes.

In Grasses, as indeed in other plants with a spicate inflorescence, this change occurs not unfrequently.