SllAI'KK : VaSCII.AR I'I.OK \ <il \ I IIUilll.NN ("oUNPY. 103 



POPULUS l.mna-us. 



* P. alba Linnious. SiUei -loaf poplar. 



Escaped to roadsides. 



* P. tremuloides Michau.x. American aspen. 



Harrison 'I'ownship, between farms of John I'otts and Jos. John- 

 ston, 1895-1900. 



* P. grandidentata Michaux. Large-toothed aspen. 



* P. balsamifera Linmeus. Balsam jjoplar. 



* P. dilatata Linmxius. Lomhardy poplar. 



CERATOPHYLLACE^ A. Gray. 



HORNWORI" KAMILV. ^'-23. 



CERATOPHYLLUM ].\v,mx^us. 

 t C. demersum Linmeus. Hornwort. 



Pittsburgh, Silver Lake, 1885. C. C. .Mellor. 



PINACE^ Liiidlcy. 

 PINK FAMIIA. Il-i. 



PINUS Linnxnis. 



* P. StTobus Linnaeus. \\ hite pine. 



* P. Virginiana >[iller. Scrub pine. 

 P. ifio/>s Aiton. 



TSUGA Carriere. 



* T. Canadensis (Linmeus). Hemlock. 



JUNIPERUS Linn;cus. 



* J. Virginiana Linn;cus. Red cedar. 



