A genus of several tropical and temperate species of aquatic plants. The name is from sagitta, an arrow, from the form of the leaves in the earliest known species.

1. S. sagittifolia (fig. 225). Arrow-head. - This is the only-one that need occupy our attention. It is a common plant in the South of England, about a foot high, with ephemeral unisexual flowers an inch or more in diameter, white with a purple centre. Segments of the perianth all similar; stamens numerous. It blooms throughout the Summer.

Fig. 225. Sagittaria sagittifolia. (1/6 nat. size.)

Fig. 225. Sagittaria sagittifolia. (1/6 nat. size.)