109 
942. S. cordata, Mulil., var. augustata, Ander. 
With the type; infrequent. (P.) 
4 943. S. glaucophylla, Bebb. 
Sandy banks of the lake shore, southeast; common, rare northward* 
April — May 10th. /? , 
944. S. adenophylla, Hook. 
Sandy soil, near the lake shore, chiefly south of Chicago; frequent. 
April 25th — May 20th. 
This most interesting willow is essentially an inhabitant of the far 
north. It is common or abundant locally on the shores of the 
great lakes. 
As it is a plant of stout growth, it is enabled to withstand the strong 
winds of the lake regions, and rooting deeply, it not only becomes 
firmly fixed in the soil, but also tends to arrest the influence of 
the winds that constantly shift the sands of its habitat. It is 
often found upon the sand dunes, in the southeastern part of our 
district, facing the lake, and holding the sands in position until a 
firm growth of grass further protects the loose soil from the 
ravages of the storms. 
945. S. myrtilloides, L., var. pedieellaris, Ander. 
Bogs; rare. May. (B. P.) 
Pine Station and Casella, Ind. Miller’s, Ind., Hill! 
POPULTJS, Tourn. 
946. P. alba, L. White Poplar. Silver-leaved Poplar. Abele. 
Escaped from cultivation and grows spontaneously in a few locali- 
ties. (P.) 
947. P. tremuloides, Michx. American Poplar. Aspen. 
Woods and open places, following the removal of timber; frequent. 
April 5th — 25th. (B.) 
'f-948. P. grandidentata, Michx. Large-toothed Poplar. Aspen. 
Woods; not common. April. 
Evanston. Niles. Palatine. 
-f-* 949. P. balsamifera, L. Balsam Poplar. 
In wet places; Evanston and northward ; rare. May 1st — 15th. (B.P.) 
950. P. monilifera, Ait. Cottonwood. Necklace Poplar. 
Includes P. angulata, Ait. 
Moist and wet places ; frequent or common. April — May. 
When planted for shade, the form with red catkins, (male trees)? 
should be selected, if it is desirable to avoid the cotton of the 
seeds. Often flowers, when not more than 10 feet high. 
