Polygonum.] POLYGONACE^. 305 



2. P. aviculare Linn. — Knot-grass. 



Districts I. II. III. IV. Y. YI. YII. YIII. IS. X, XI. XII. 



Lat. 51i°-55J°. Throughout Ireland. Type, Britisli. 



Fields, -waysides, &c. ; common. Fl. June-September. 



Sea-level in Donegal and Cork. To 950 ft. ia Dublin {N. C). 



A very variable species, the different forms of which have been 

 little studied in Ireland. The varieties iitiobat.e {Linh), aeenastettm 

 {Bar.), and ETJEtvAGina: {Jord.) have been recorded for Co. Down, and 

 are probably frequent throughout Ireland. 



3. P. Rail Bab. — Ray's Sea Knot-grass. 



P. Rdberti Loisel. 



Districts I. II. — lY. Y. YI. — YIII. XI. XII, 



Xat. 51f°-55i°. Coasts of all Ireland, probably. Type, British. 



Sandy sea-shores ; not infrequent. Fl. August-September. 



I. Below Camp on the Dingle promontory, Kerry : Swrt 1884. 

 Sandy point near Ardgroom harbour, Cork {More) : Reo, AM. — 

 II. BaUycotton, and Eing Point, Youghal (as P. maritimum) : Flor. 

 •Corh. Frequent on the Waterf ord coast : Cyl. Sf Ha/rt 188^ /?. — 

 lY. On the shore of the Murrough of "Wicklow {Moore) : Cyl. 

 "Wexford coast, at Hook Head ; Greenore ; and Sandeel Bay : Hart 

 j88j p. — Y. EUHney Bay (as P. maritimum) : Brit. Flor. 1842. 

 Not infrequent on the coast of Co. Dublin : Cyl. : Flor. Sowth, ^e. 

 Shore south of Gormanstown {More) : Rec. Add. — YI. ISesx 

 Kilronan, Aranmore Island : Oliver z8jz. In Co. Clare, at Miltown 

 Malbay {Prof. Ka/rvey) ; and at Lahinch ( C Carter) : Cyl. — 

 YIII. On the coast near Galway {Prof. Graham) : Cyl. — XI. and 

 X!II. ITot infrequent on the coasts of Donegal, Antrim, and Down. 



Some of the above records are probably referable to the Far. 

 AEENASiBUM of the preceding species, 



4. P. Hydropiper Linn. — Biting Persicaria. 



Hilerniei '^\\^^T\eab ceic {Oloon-yach-tchai), Sot Kneed-plamt. 

 Districts I. II. III. lY. Y. YI. YII. YIII. IX. X, XL XII. 

 Xat! 51i°-55i°. Thi-oughout Ireland. Type, British, 



"Watery places and damp waste grouhd ; common. Fl. August- 

 .September, Calcifuge A. 



