42 ANNALS OF SCOTTISH NATURAL HISTORY 



In No. 1 5 the glands extended to the fruit, which happens but 

 rarely in Scotland, so far as I have observed. In Nos. 15 and 52 

 the petioles are glandular, and the glands extend to the mid-rib and 

 even to the secondary veins on some few leaflets. 



The next two of Crepin's groups comprise those forms of R. 

 glauca which have the under side of the leaves more or less glandular. 

 These appear to be exceedingly rare in Scotland, and none of the 

 specimens can be referred to them. 



R. CORIIFOLIA, Fr. 



I. Teeth simple, pedicels smooth. 



Nos. ii and 63. 

 The type of Fries. 



II. Teeth double or composite, pedicels smooth. 



Nos. 59, 66, 73. 

 I have some doubt as to No. 73. It may be a sub-collina form. 



III. Teeth simple, pedicels hispid-glandular. 



Nos. 6, 8, 12, 78. 

 These have also the sepals glandular on the back. 



IV. Teeth double or composite-glandular, pedicels hispid- 



No specimen. 



glandular. 



V. Teeth double or composite-glandular, pedicels smooth, 

 leaflets more or less glandular below. 



No specimen. 



VI. Teeth double or composite-glandular, pedicels hispid- 

 glandular, leaflets more or less glandular below. 



No specimen. 



It is very likely that forms belonging to these three groups occur 

 in the Buchan district, though not represented in the gatherings. 

 Group V. certainly occurs in N. Aberdeen, as I have a note of 

 having seen two bushes belonging to it near Huntly. 



It should be noted that the foregoing analysis of canina, glanca, 

 and coriifolia forms is quite artificial. Each division represents not 

 merely a variety, but a group of allied forms, which, however, differ 

 in secondary respects from each other. Many, if not most, of the 

 groups comprise forms which have been described and named as 

 varieties, and even as distinct species. 



