166 ANNALS OF SCOTTISH NATURAL HISTORY 



U. suberosa, Stokes, reported from 72-77, So, Si, 83, 86, 87, 90, 

 91 ; doubtless in most counties, but doubtfully indigenous in 

 Scotland. 



Hiinnthts Lupulus, L., 72-77, So, Si, 83, 85-92, 95-97. There is 

 no sufficient reason to regard the hop as indigenous anywhere 

 in Scotland, though recorded from some districts without 

 comment. In most habitats its introduction is evident. 



Urtica dioica, Z., all. This certainly owes its wide diffusion, if not 

 its introduction into Scotland, to man's indirect aid. 

 b. angustifolia, A. Blytt ; occasional. 



U. urens, Z., except 98. Even more suggestive than U. Dioica of 

 man's assistance. 



^arietaria officinalis, Z., 73-79, 81-83, 85-87, 90, gij, 927, 93!, 

 94t, 95t, 9 6 t> 99> I0 t, io6f. 



MYRICACE^E. 

 Myrica Gale, Z., except 78, 80, 81, 82, 112. 



CUPULIFER/E. 



2 Betula alba, agg., except 110, 112. 



B. verrucosa, Ehrh., 72-74, 76, 77, 85, 87-89, 91, 92, 95, 96, 100, 



101, 105, 106, 108, 109. 



B. pubescens, Ehrh., 72-74, 76, 77, So, 87-89, 91, 92, 96-100, 



102, 104, 105, 107, in. 

 B. intermedia, Thomas, 92, 108. 



B. nana, Z., 77 (?), 78, Si (?), 88-90, 92, 94, 95 (?), 96-98, 105, 



106, 108. 



Alnus glutinosa, Z., except HOj, 111^, 112. 

 Carpinus Betulus, L., recorded from 72, 73, 75-78, 81, 83, 85-88, 



90-92, 95, 100, 101, 103, but probably nowhere indigenous. 



3 Corylus Avellana, Z., except 112. 



4 Quercus Robur, Z., except 75, 79, 109, 110 j, 111, 112. 



a. pedunculata (Ehrh.\ 72-74, 76-78, 80, 82, 83 f, 84, 

 85!, 86-89, 9 1 , 9 2 > 95-99- 



1 Parietaria officinalis, L., is restricted, at least in the north of Scotland, to 

 old masonry. Probably the sign f should be more freely used than it has been ; 

 but only a knowledge of the habitats can determine this for each district. 



a Betula alba, L. The forms included under the aggregate are not sufficiently 

 distinguished in local lists to permit of indicating their distribution satisfactorily. 



3 Corylus Avellana, L. The abundance of nuts in peat-bogs of the northern 

 counties shows that the Hazel was formerly plentiful where it is now extinct or 

 much restricted, e.g. in the Hebrides and Orkney. 



4 Quercus Robur, L. That this is native in the Highlands is shown alike by 

 the remains in peat-bogs, and by the frequency of the Gaelic name in the names 

 of places. Probably it has been introduced into every district in which it was 

 not already native. In Aberdeenshire, and elsewhere in the north, the fruits 

 seldom grow large or ripen. The varieties have not been distinguished in a good 

 many districts in which they doubtless occur. 



