70 LACKAWANNA AND WYOMING FLORA. 



98. LEMNACE^. 



SPIRODELA, SCHLEIDEN. 



766. S. polyrrhiza, SCHLEID. Wyoming Sw.; Tobyhanna. Dudley. 

 Kingston "Pond Holes." Thurston. 



LEMNA, L. 



767. L. perpusilla, Torr. In a pond near Tobyhanna, June, 1890. 

 Dudley. 



768. L. minor, L. Wyoming Swamp. Dudley. 



99. ALISMACE^:. 



ALISMA, L. 



769. A. Plantago, L. (Var. Americanum, R. and S.) WATER PLAN- 

 TAIN. Near Wyoming. Dudley. Kingston "Pond Holes." Thurston. 



SAGITTARIA, L. 



ARROW-HEAD. 



770. S. variabilis, Engelm. Mud pond near Tompkinsville ; Heart 

 Lake, Tompkinsville. Graves. Mouth of Lackawanna River ; Kings- 

 ton, etc. Dudley. 



771. S. heterophylla, Pursh. Kingston "Pond Holes." Thurston. 

 Heart Lake, near Tompkinsville. Graves. 



ioo. NAIADACEiE. 



SCHEUCHZERIA, L. 



772. S. palustris, L. Tobyhanna Mills. Prof. Porter. Ararat 

 Marsh. Dudley. 



POTAMOGETON, TOURN. 



773. P. natans, L. Pond in lower Lackawanna Valley; Lake Henry, 

 in herb. Dudley. 



774. P. Pennsylvanicus, Cham. (P. Claytonii^ Tuck.) Tobyhanna 

 Mills. Prof. Porter, Dudley. In Lehigh Pond and outlet. Dudley. 



