8200 AQUATIC FLOWERING PLANTS*
Aquatic flowering plants belong to the phylum Spermato-
phyta, characterized by possession of true roots, stems, and
leaves, and production of seeds from flowers. The phylum con-
tains most of the conspicuous land plants of the world. Aquatic
flowering plants are almost exclusively fresh-water inhabitants.
Test procedures are described for duckweed (8211), which floats
on the surface of the water, and aquatic emergent plants (8220),
which have roots extending into the sediment.
* Joint Task Group: 20th Edition—Donald J. Reish.
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