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
Marine submerged plants with creeping stems Halophila
Leaves glabrous, with 10–14 pairs of lateral veins. Plants dioecious. Spathe 1-flowered. On sand and mud in protected marine habitats Halophila ovalis
Leaves with fine hairs on the lower surface, with 6–9 pairs of lateral veins. Plants monoecious. Spathe with 1 male and 1 female flower. On sand in protected marine habitats Halophila decipiens