xii 
Viola— Continued. 
retroscabra, 290 
etusa, 
rotundifolia, 8 
sarmentosa, 
sempervirens, 8 
septemloba, 
septentrionalis, 294 
subcordata, 286 
subsinuata, 5 
subviscosa, 293 
a 
venustula, 295 
vicinalis, 
Watsonii, 5 
Vittaria 
elongata, 106 
isoetifolia, 106 
lineata, 106 
INDEX. 
Vittaria— Continued. 
zosterzfolia, 106 
Walter, author of 
nomina seminuda, 263 
Xamacrista, 26 
Xanthium, species by 
Rafinesque and by Wall- 
roth, 59 
Xanthium 
acerosum, 63 
affine, 60 
Californicum, 62 
palustre, 63 
silphiifolium, 60 
strumarium, 58 
Merge 59 
Za 
smelt 47 
lanceolata, 47 
nodiflora, 47 
Zebrina pumila, 225 
Zygadenus 
gracilentus, 241 
longus, 
