FOLYGONACE^, 123 



7. R. acetosella Linn. Sheeps' Sorrel. 



Heaths, bogs, and bare stony pastures— very common. Fl. June— 

 Aug. 



POZ.TGOIO'UM Linn. 



1. P. amplilbluin Linn. 



Lakes, ponds, ditches, slow streams, and marshes— common. Fl. mid. 

 June till end of Aug. 



2. P. lapatblfollum Linn. 



Peaty, and damp sandy fields— frequent in the south of the district. 

 Fl. July and Aug. 

 Down — Mountpottinger, Ballygowan, and Cotton moss ; Flor. Belf. 



{snb F. nodosum). Belmont, Dundonald, Newtownards, 



Monlough, and bogs about Ballynahinch ; S.A.S. 

 Antrim— Near Belfast ; Flor. Hib. Shore road ; Flor. Belf. Abundant 



by Lagan canal above Moira station; S.A.S. Whitewell; 



E.Ll.P. 

 Derry— Ballyronan, and Moneymore ; Flor. Ulst. 



3. P. perslcarla Linn. Redshank (loc). 



Cultivated fields, and waste places— very common. Fl. mid. June till 

 mid. Sept. 



4. P. hydropiper Linn. "Water Pepper. 



In marshes, and by streams — common. Fl. Aug. and Sept. 



5. P. minus Hudson. 



Sandy and gravelly lake, and river margins — rare. Fl. mid. July till 



mid. Sept. 



Down — Ballygowan Lake ; Templeton, 1807. Margin of Lough Henny 

 near Saintfield ; Flor. Belf. Abundant by the margin of 

 Monlough ; Cyb. Hib. Downpatrick, and by Newry canal 

 occasionally ; S.A.S Ballynahinch and by the lake at Clan- 

 deboye; R.Ll.P. 



Antrim — Dam above Whitehouse ; Flor. Ulst. 



Derry— Side of the Bann below Coleraine ; Flor. Hib. Sparingly by the 

 Bann above the Cutts ; D.M. 



6. P. avlculare Linn. Knotgrass. 



Waysides, and waste ground— very common. Fl. June — Aug. 



Var. /J P. LiTTORALE Link. 

 This form, which is often taken for the follow^ing species, occurs on 



