FLORA OF MICHIGAN. 135 



*1114. S. HUMILISX DISCOLOR, Bebb. 

 Keweenaw Co., Farwell. 



*1115. S. FRAGiLisXALBA, Wimmer. 

 Coleman's Catalogue ; Palmer's Catalogue. 



394. POPULUS, Tourn. POPLAR. ASPEN. 



1116. P. ALBA, L. White Poplar. Abele. 

 Occasionally escaped from cultivation. 



* 1117. P. tremuloides, Michx. American Aspen. Th. 

 Woods and lake shores; most abundant in U. P., Whitney. Common. 



* 1118. P. g'randidentata, Michx. Large-toothed Aspen. Th. 

 Woods. Common northward, but " rare in U. P.," Whitney Oat. 



* 1119. P. balsamifera, L. Balsam Poplar. Th. 

 River banks. A small tree in Michigan. 



*1120. var. CANDICANS, Gray. 



Common in cultivation. 



*1L21. P. monilifera, Ait. Cotton- wood. Necklace Poplar. L. P. 



Sometimes a large tree, three feet in diameter. Infrequent. Collected by the Forestry Commission 

 Expedition party, June, 1888, in Alcona Co. 



LXXXVIIL EMPETKACE^E. CBOWBERBY FAMILY. 



395. EMPETRUM, Tourn. BLACK CROWBERRY. 



1122. E. nigrrum, L. U. P. 



Whitney Cat. Pictured Rocks, G. H. Hicks. 



LXXXIX. CEEATOPHYLLACE.E. HORNWORT FAMILY. 



396. CEKATOPHYLLUM, L. HORNWORT. 

 *1123. C. demersum, L. Th. 



Ponds. Fruit in August. Common. 



XC. HYDEOCHAEIDACE^E. FROG'S-BIT FAMILY. 



397. ELODEA, Michx. 



*1124. E. Caiiadensis, Michx. Water-weed. Th. 



Slow streams. Common. " 



398. VALLISNEBIA, L. 



*1125. V. spiralis, L. Tape-grass. Eel-grass. Th. 



Ann Arbor, Winch. Cat.; S. Haven, Bailey; Hubbardston, to Petoskey; Lake Superior, Agassiz. 

 Slow streams. Common in Grand River and tributaries. 



XCI. OECHIDACE^E. ORCHIS FAMILY. 



399. MICBOSTYLIS, Nutt. ADDER'S-MOUTH. 



1126. M. monopliyllos, Lindl. 



Hubbardston; {Flint; Macomb iCo.;"bogs near Long lake and Black 'lake, Cheboygan Co., B. & K. 

 Rare. 



1127. M. ophiogrlossoides, Nutt. 



Ann Arbor, Allmendinger Cat.; Hubbardston ; Lenawee Co., G. F. Comstock. Rare. 



