68. 
clandestinum, Linn, 
microscarpon, Muhl. 
xanthophysum, Gray 
dichotomum, Linn, 
depauperatum, Muhl. 
k 
crus-galli, Linn. Bary-yard Grass. Introduced 
c 
hispidum, Muhl. 
scoparium, Michx. 
Setaria, Beauvois 
glauca, Beauv. Introduced 
Cenchrus, Linnaeus. Bur-grass 
tribuloides, Linn. 
Tripsacum, Linnaeus 
dactyloides, Linn. Gama Grass 
Erianthus, Michaux 
alopecuroides, Ell. 
Andropogon, Linnaeus. Beard-grass 
furcatus, Muhl. 
scoparius, michx. 
Virginicus, Linn. 
Sorghum, Persoon. 
nutans. Gray. 
EQUISETACE'AE The Horsetail Family 
Equisetum, Linnaeus. Horsetail 
arvense, Linn, 
laevigatum, Braun, 
robustum, Braun. S. 
hyemale, Linn. Scouring Rush. 
FELICES. The Ferns 
Polypodium, Linnaeus 
