22 The Scottish Naturalist. 



EMPETRACE^S. 

 CLXV. Empetrum L. 



305 nigrum L., B. Common. In one or two localities in such 



profusion as to scent the air. 



EUPHORBIACE^E. 



CLXVI. Euphorbia L. 



306 Helioscopia L., B. Common. 



307 Peplus L. Swanbister, 1873, B. Gardens at Kirkwall, H. 



Mercurialis Tourn. 



308 perennis L. Recorded by Miss Boswell. 



CERATOPHYLLACEvE. 



Ceratophyllum L. 



309 aquaticum, E. B. 3. 



b. demersum, Loch of Ayre. Hubbin at Kirbuster, H. 



URTICACE^. 



Urtica Tourn. 



310 dioica L., B. Common. 



311 urens L., B. Common D. and H. Kirkwall, Swanbister, 

 Hoy. Rather local. Turmiston in Stennes, J. W. H. T. 



AMENTIFERuEJ. 

 Corylus Tourn. 



312 Avellana'L. Berriedale Hoy, B. Elsewhere in Hoy, H . 



Betula Tourn. 



313 alba. 



b. glutinosa, B. In several places in Hoy. 



Myrica L. 



314 Gale L. " Eday, J. R. Hebden." D. and H.'s list. 



Populus Tour. 



315 tremula L., B. Hoy, Walls, Hobbister Cliffs, Flotta Calf. 



Salix Tourn. 



316 acuminata Sm. Moist places. Dearness, Neill. 



317 cinerea L., B. Rather scarce. 



b. aquatica B. 



318 aurita L., B. Common. 



319 Caprea L., B. Walls and Hoy. 



320 phylicifolia L., B. Rather common. This and the two last 

 species are called Rice in Orkney. 



321 nigricans Sm. I think a plant from Groundwater (Orphir) is 

 this, B. 



