264 Botany of Uhnois and Missouri. 
a mark of doubt. Iam now convinced that they do not be- 
long to that Was . 
Cornus florida Lin 
Has. On the banks of the Illinois river, 50 miles above 
tts mouth—not common. March—April. 
Cornus circinata’ Willd. 
Has. On the pmecigan bottom opposite to St, Louis. 
pril. 
| Cornus sericea Wi lid. 
Has. With the last. 
Plantago virginica Liu ‘a 
Has. Near St. Louis and Seewhare: akoaiae on. | 
Tt varies considerably in height and in the size of its leaves. 
Plantago pusilla Nu tt. 
Has. On the mounds about one mile north of St, Louis. 
April. The apecmens which | observed were Jape three 
inches high; and were not armed with the subulate bracts 
_ belonging to P. aristata of Michaux, with which this species 
sae been confounded, 
Ptelea erifoliata Lin 
Te. Timbered alluvions of the Mississippi, at St. Louis 
and elsewhere. May. In my specimens the leaves are 
ate pubescent on the under surface, and have a whitish 
olour. 
TETRANDRIA, TETRAGYNIA, 
ramen cee Fane Mich. 
Potamogeton aes 
a these ssietien are found in ponds west of St. Louis, 
(To be continued, ) 
