5l8 TRANS. ST. LOUIS ACAD. SCIENCE. 



Q. Muhlenbergii, Engelm. Trans. St. L. Acad. iii. 1877. ■^ 



Des Moines river at Boone (Prof. Pammel. Prof. Budd). 



Q. RUBRA, L. Spec. 



Upland woods; abundant. 



Q. coccinea, Wang. Beitr. 1787. 



In the I. A. C. herbarium is a specimen, with acorns, collected by Dr. BesseVj 

 said to come from a tree northwest of the College near the railroad. I have been una. 

 ble to find the tree, and have not observed the species in the county. It is abundant 

 in the eastern part of the State, where, to a large extent, it replaces ^. rubra, and 

 extends at least as far west as Waterloo. The leaf is not to be distinguished from 

 ^. ^-w^^-a, although it is generally more deeply parted; the acorns of the two species 

 are quite different. 



SALICACE^. 



Populous TREMui.oiDES, Michx. Fl. 



Borders of woods ; infrequent. 

 P. GRANDIDENTATA, Michx. Fl. 



A few young trees and sprouts were found along the bluffs of Skunk river nortli- 



east of Ames, Prof. Budd informs me that formerly it was quite abundant. 



P. MONiLiFEKA, Ait. Hort. Kew. 



Lowland woods ; not uncommon. 

 Salix NIGRA, Marsh, Arbust. 



River banks ; common. 

 S. LONGiFOLiA, Muhl. Neue Schrift. Ges. Nat. Fr. Berlin, iv. 1802? 

 (ex Anders. Salic.) 



Low, especially sandy ground; common. 

 S. DISCOLOR, Muhl. 1. c. 



Low ground ; common. 

 S. HUMiiiis, Marsh. Arbust. 



Dry hills and copses; frequent. 

 S. CORDATA, Muhl. N. Berl. Schr. I.e. 



Low land ; common. 



CERA TOPHTLLA CE^E. 



Ceratophyllum demersum, L. Spec. 

 Ponds ; becoming scarce. 



COIVIFER.E. 

 (This Order more properly follows Graminerf.) 



Juniperus Virgiuiana, L. Spec. 



Along the Des Moines river (Prof. Budd). 



HI DR O CHAR /DA CEjE. 



Elodea Canadensis, Michx. Fl. 

 Ponds; becoming infrequent. 



For synonymy see Pringsheim's Jahrbiicher, i. p. 499. 



Vallisneria spiralis, L. Spec. 



Cairo lake. 



