$lb TRA.NS. ST. LOUIS ACAD. SCIENCE. 



<). Muhlenbergii, Engelm. Trans. St. L. Acad. iii. 1877. 



Des Moines river at Boone (Prof. Pummel. 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. Bessey r 

 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 JfJ. rubra, and 

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

 jf\ rubra, although it is generally more deeply parted; the acorns of the two species 

 are quite different. 



SALICACEjE. 



POPUEUS TREMUEOIDES, Michx. Fl. 



Borders of woods ; infrequent. 

 P. GRANDIDENTATA, Mlchx. Fl. 



A few young trees and sprout^ were found along the bluffs of Skunk river north- 

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



P. monieifera, Ait. Hort. Kew. 



Lowland woods ; not uncommon. 

 Salix nigra, Marsh. Arbust. 



River banks; common. 

 S. eongifoeta, Muhl. Xeue Schrift. Ges. Nat. Fr. Berlin, iv. 1802? 

 (ex Anders. Salic.) 



Low. especially sandy ground; common. 

 S. discolor, Muhl. 1. c. 



Low ground; common. 

 S. humieis, Marsh. Arbust. 



Dry hills and copses; frequent. 

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



Lowland; common. 



CERA TOPHYLLACE^E. 



Ceratophyeeum demersum, L. Spec. 

 Ponds; becoming scarce. 



COyiFER.E. 

 (This Order more properly follows Graminco'.) 



Juniperus Virginiana, L. Spec. 



Along the Des Moines river (Prof. Budd). 



HYDROCHARIDAi \ 



Elodea Canadensis, Michx. Fl. 



Ponds; becoming infrequent. 

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



Vallisneria spiralis, L. Spec. 

 iro lake. 



