60 LACKAWANNA AND WYOMING FLORA. 



676. P. BALSAMIFERA, L. Var. CANDICANS, Gray. BALM OF GILEAD. 

 Several middle-sized trees along the Susquehanna above Kingston ; 

 near Mocanaqua. Dudley. 



Populus alba (the Silver Poplar), with downy white leaves, is fre- 

 quently planted in towns. P. dilatata (Lombardy Poplar) is planted. 

 "The single tree near Dickson Sta. was probably planted." Davis. 



85. CERATOPHYLLACE^. 



CERATOPHYLLUM, L. 



HORNWORT. 



677. C. demersum, L. Pond in lower Lackawanna Valley; at 

 Gouldsboro ; L. Henry, abundant. Dudley. 



GYMNOSPERMS. 



86. CONIFERS. 



PINUS, TOURN. 

 PINE. 



678. P. Strobus, L. . WHITE P. Common on the hills. 



679. P. rigida, MILL. PITCH PINE. Frequent on dry hills. 



680. P. inops, Ait. SCRUB PINE. Frequent on barren hills in Wyo- 

 ming Valley. 



681. P. resinosa, Ait. RED PINE. Campbell's Ledge, a single tree. 

 Thurston. Frequent on the cliffs, up the Susquehanna, from Camp- 

 bell's Ledge. Dudley. 



PICEA, LINK. 

 SPRUCE. 



682. P. nigra, Link. BLACK S. Swamp at head of Little Roaring 

 Brook ; about Lehigh P.; near Tobyhanna, and elsewhere on the 

 Pocono plateau. Dudley. Moss' Swamp, N. of Luzerne. G. B. Stone. 



