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Keys
Vascular plant groups
Club mosses
Ferns
Vegetative key to families
Gymnosperms
Flowering plants
Genera
Families
Vegetative key to the families
Vegetative Key
Vegetative key to the families
consider the other alternative
FREE FLOATING WATER PLANTS; roots, when present, not rooted in the mud. (Note: there are 2 genera of ferns which are free floating, see Azolla and Salvinia)
consider the other alternative
Whole plant not exceeding 5 mm long
Lemnaceae
consider the other alternative
Roots present on the undersurface
choose this alternative
reject this alternative
Roots never more than 1 on each
cladode
Lemna
choose this alternative
reject this alternative
Roots variable in number on each
cladode
, often 2–5, only occasionally fewer or more