104 ROCHESTER ACAt)EMV OF SCIENCE. fOct. 8, 



896. S. humilis Marsh, x S. discolor Muhl. (?) 



Dry bank of Genesee river. Twenty plants in one g^roup. 



8g7. S. sericea Marsh. Silky Willow. 

 Wayne county, E. L. Hankensoti . 



898. S. petiolaris J. E. Smith. 



Monroe county, Dr. C. Dewey. Wayne county, E. L. Hankenson. 



899. S. Candida Willd. [5. <r^;/^/zV/<7 Fliigge.] Hoary Willow. 



Cold swamps and sphagnum marshes; scarce. Marsh at head of 

 Irondequoit bay, Dr. C. M. Booth! Riga, Miss F. BeckwitJi . Adams 

 Basin, M. S. Baxter. Mendon, G. T. Fish. Caledonia, Livingston 

 county, Clinton. Bergen swamp, Genesee county. Wayne county. 



900. S. PURPUREA L. Purple Willow. 



Low grounds and along streams ; common . 



901. S. cor data Muhl. Heart-leaved Willow. 



In springy places on rocky river banks, ravine sides, low grounds and 

 along streams ; very common. 



902. S. cordata Muhl. X S. sericea Marsh. [S . myricoidcs Muhl.) 



Reported only by G . T. Fish . 



903. S. myrtilloides L. Myrtle Willow. 



Rare. Mendon, G. T. Fish ; M . S. Baxter, 1895. Wayne county. 



367. FOPULUS Tourn. [L.] 



904. P. ALBA L. White Poplar. Abele. 



Roadsides; occasional. Produced by suckers from the roots of 

 planted trees. 



905. P. tremuloides Michx. American Aspen. 



River banks, ravines, hillsides ; common. 



906. P. grandidentata Michx. Large-toothed Aspen. 



L)ry woods, river banks and hills ; common. 



907. P. balsamifera L. Balsam Poplar. 



Near the lake, in the town of Greece. Border of Bergen swamp. 

 — P. BALSA.MIFERA L. var. CANDICANS Gray. \P. balsamifera candicans 

 (Ait.) A. Gray.] Balm of Gilead. 

 Occasionally planted along roadsides. 



908. P. monilifera Ait. Cotton wood. 



Frequent along the banks of the Genesee river and about Irondequoit 

 bay ; common along the shore of lake Ontario. Wayne county. 



909. P. dilatata Ait. [P. nigra L.] Lombakdy Poplar. 



Bank of Genesee river, Greece. Frequently planted along roadsides. 



CERATOPHYLLACEyE. 



368. CF.RATOPHYLLUM L. 



910. C. demersum L. Hornwort. 



FrequL-nt in all our bays and ponds. 



