ALISMACE^. 141 



Order LXI. AI.ZSI^ACE 



AZ.ZSMA Linn. 



1. A. plantago Linn. Water Plantaix. 



Ditches, and ponds — very common. Fl. mid. June till mid. Aug. 



2. A. ranunculoldes Linn. 



Marshes, ponds, and lake margins — common, especially abundant in 

 sandy districts. Fl. June and July. 



SAGZTTARZA Linn. Arrowhead. 



1. S. sagrlttifolia Linn. 



Rivers, lakes, and ditches — rare. Fl. July and Aug. 



Down— Pond at Belmont, and many places in the Xewry canal, also fre- 

 quent in the Lagan canal from Lough ^eagh to near Belfast ; 

 S.A.S. The Lagan stations belong equally to Antrim. 



Antrim — In the large di-ain at Poilmore, and other places about Lough 

 Neagh, also in the Bann at Portglenone; Templcton, 1794 

 (stni found about these places). In Lough Xeagh near An- 

 trim ; Flor. Ulst. In Lough Xeagh north of Lurgan ; S.A.S. 



Derry — In a small lake above Kilrea, and abundant by the Bann from 

 Toome to near Coleraine ; D.M. In the Bann at Toome ; 

 S.A.S. 



BUTOIVIUS Linn. Flowering ErsH. 



1. B. umbellatus Linn. 



Ditches, rivers, and lakes— rare. Fl. mid. June till mid. Aug. 

 Do^-n —South end of Lough Leagh ; Templeton, 1804. Lagan near Bel- 

 fast ; Flor. TJht.^ Abimdant in Lagan canal near Moira and 

 elsewhere, also in the lake at Ballynahinch ; S.A.S. Marshes 

 in the neglected Victoria Park ; PuBl.P. 

 Antrim— Lagan canal, as above. 



Not known to Mr. Templeton as occuiTing in the canal, and doubtless 

 introduced there as stated in Flora of Lister. 



TRZGIiOCHZKr Linn, Arrowgrass. 



1. T. marltimum Linn. 



Muddy seashores— common. Fl. latter end of May till mid. Aug. 



