calamus, Linn. Sweet Flag. 
TYPHACEAE The Cat-Tail Family 
Typha, Tournefort 
latifolia, Linn. Cat-tail 
Sparganium, Tournefort 
ramosum, Hudson. 
simplex, Hudson. (S. Americanum, Nutt.) 
LEMNACEAE The Duckweed Family 
Lemna, Linnaeus, Duckweed 
trisulca, Linn 
Lemna, Qiinor, Linn. 
polyrrhiza, Linn. 
NAIADACEAE The Pondweed Family 
Pctamogeton, Tournefort 
bybridus, Michx. S. 
pusillus, Linn. (P. compressus, Smith.) S. 
panciflorus, Pursh. (P. gramineus, Michx.) 
lucens, Linn, 
natans, Linn. 
heterophyllus, Schreber ' 
ALISMACEAE The Water-Plantain Family 
Alisma, Linnaeus 
piantago, Linn. 
Echinodorus, Rich 
parvulus, Engelm. 
rostratus, Engelm. (Alisma rostrata, Nutt/) 
ralicans, Engelm. (Alisma radicans, Nutt.) 
Sagittaria, Linnaeus. Arrow-head 
vanabilis, Engelm. 
