Hydrocharitaceae

Partially or wholly submerged herbs, sometimes marine Hydrocharitaceae

Ovary inferior; male flowers with more than 1 stamen

Fresh water plants

Leaves all basal arising from a rootstock growing on the bottom of a stream or pond

Leaves cauline, opposite or whorled, on elongated occasionally branched submerged stems with adventitious roots. Flowers unisexual, axillary