The Scottish Naturalist] 



85 



S. afflne. 



Old quarries ; Lynegar, and between Scotscalder and Halkirk, 

 Dr. Davidson ! 

 S. minimum. 



Ponds between Gerston and Scotscalder ; Winless ; Yarrows ; 

 Dunn ; Shrival ; Calder Loch ! Halkirk, Dr. Davidson \ 

 tArum maculatum. 



Nicolson. 



Lemna minor. 



Old quarries ; Stirkoke ; Harten ; Kirk ; Toftcarl. 

 L. gibba. 



R. Dick in Watson's MS. 

 Trigiochin palustre. 



Common in marshes. 

 T. maritimum. 



In marshes by the sea. 

 Potamogeton natans. 



Common in quarries and lochs ; Durran ! Wick River ! 

 P. polygonifolius. 



On moist ground among hills ; Yarrows Hills ! Acharole Burn ! 

 Var. angustifolius. 



Freswick and Acharole Burns ! 

 P. rufescens. 



Mill-lade near Thurso River ! Wick River near Westerseat ! 

 Watercourse at Loch Yarrows ! Stream near Loch Win- 

 less, W. R. Linton ! 



P. heterophyllus. 



Wick and Thurso Rivers ! Lochs Watten and Yarrows ! 

 P. nitens. 



Wick River above Sibster ! Thurso River below Bleachfield ! 

 Loch Winless ! Watten Loch, Dr. Davidson ! 

 P. prselongus. 



Lochs Hempriggs ! Watten ! and Calder. Yarrows Loch ! 

 Watercourse near Wick reservoir ! 

 P. perfoliatus. 



Loch Wester ; Wick River ! Thurso Mill-lade ! Barrogill. 

 P. cnspus. 



Loch Wester ! Wick River ! Watercourse leading from Loch 

 Yarrows ! Thurso River, F. J. Hanhury ! 



