51 . 
CERATOPHYLLACEAE The Honewort Family 
Ceratophyllum, Linnaeus 
demersum, Linn. 
EQPHORBIACEAE The Spurge Family 
Euphorbia, Linnaeus 
Geyeri, Engelm 
herniarioides, Nutt. S. 
hums it rata, Engelm. S. 
maculata, Linn, 
hypericifolia, Linn, 
dentata, Michx. S. 
cyanthophora, Jacq. S. 
corollata, Linn 
obtusata, Pursh S. 
Acalypha, Linnaeus 
Virginioa, Linn, 
gracilens. Gray 
Caroliniana, Waltr. 
Croton, Linnaeus 
capitatum, Michx. 
glandulorum, Linn. 
monanthogynum, Michx. (C . Ellipticum, Nutt.) 
Crotonoosis, Michaux. 
linearis, Michx. 
Phylianthus, Linnaeus. 
Carol mens is, V>altr. 
URTICACEAE The Nettle Family 
1. Ulmace Tne Elm Tribe 
Ulmus, Linnaeus, Elm. 
fulva, Michx. Slippery Elm. 
