i 7.Transverse section of the stele of the stem of a water-plant (Naias);
pot ycarpa, Potamogeton interrupt us (=~ P. flabellatus), and Naias marina.
Very few aquatic plants are pollinated under water, but this is wellknown to occur in species of Zostera and of Naias.
- Notommata naias.
In some aquatics, as Zostera, Zannichellia, Naias, &c., only one covering exists.
Aquatic vegetation may be conveniently classified as follows: Aquatic plants with submerged leaves: Chara spp., Naias spp., Potamogeton pectinatus, Ceratophyllum spp., Myriophyllum spp., Hottonia palustris, Utricularia spp.
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