Magnoliophyta

Ovules (and seeds) enclosed within carpels (fruits); the carpels bearing stigmas upon which the pollen lodges. Pollen produced in the anthers of stamens. Carpels and stamens usually surrounded by a perianth; the whole constituting a flower which may be uni- or bi-sexual (= angiosperms) Magnoliophyta
Flowers usually 3-merous. Leaf venation usually parallel. Embryo with 1 cotyledon Plants usually herbaceous rarely woody and then ± unbranched) Liliopsida
Ovary inferior
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