12 CRUCIFER^. 



Fl. mid. May till end of July. Templeton says, '* Common on the mud 

 thrown up from the bed of the Blackstaff River." Still abundant in the 

 Bog meadows, on the mud raised when cleaning, and deepening the river. 



SZirAPZS Linn. Mustabd. 



1^ S. nigra Linn. Black Mustard. 



*' Growing on ditch banks, at the side of the Falls Road, about half a 

 mile from Belfast, 1808." "Common about Carrickfergus, in flower 

 11th July, 1808" ; Templeton. *' Not unfrequent near Kilrea, County 

 Derry" ; D.M. Not now to be foimd near Belfast or Carrickfergus, 

 and probably this, and the succeeding species, are mere casuals in this 

 district. 



2. S. alba Linn. White Mustard. 



Abundant in the field surrounding the old church at St. John's Point, 

 County Down ; S.A.S., 1878 ; probably imported with seed. 



"Very common on the lands of Myroe near Magilligan, Co. Derry. 

 It appears most on new made ditches, never in planted fields." William 

 Temiant ; Teinpleto7i MS. Perhaps naturalised ; not native. 



3. S. arvensis Linn. Charlock. Prushus (loc). 



Waste ground, and cultivated fields— very common. FL May — xYug. 



DRABA Linn, 



1. B. Incana Linn. 



Rocks, and coast sandhills — extremely rare. Fl. July and Aug. 

 Derry — Sandy warren of Magilligan, at 20 feet, and on Benevenagh 

 rocks at 1100 feet ; D.M., 1835. In the latter place ; S.A.S., 

 1884. Not found recently on the sandhills, and a careful 

 search over the cHffs revealed only a very few plants ; perhaps 

 becoming extinct in Derry. 



2. D. verna Linn. Whitlow Grass. 



Walls, dry rocks, and sandy or gravelly wastes — not common. Fl. 



April to June. 



Down — Spalga Mountain Rostrevor at 1200 feet, sandhills at Newcastle, 

 and Bally kinler, also on walls of old abbey at Newtownards ; 

 S.A.S. 



Antrim— Massereene park- wall, and stone dykes on the east side of Lough 

 Neagh, about two miles from Antrim ; Templeton. Bally- 

 castle, and Portrush ; Flor. TJlst. Abundant on gravel at 

 mouth of Six -mile River, at Antrim ; I). Redmond. 



Derry — Bannfoot, and warren of Magilligan ; D.M. 



