THE HIGH ALPINE FLORA OF BRITAIN 167 



Fam. 26. POLYGONACE^:. 



95. Rumex acetosa, L. Ascends to the summits of Ben 

 Lawers and Ben Alder (F. B. White), and to 1037 m. in Glen 

 Spean (E. S. Marshall, in "Journ. Bot." 1897, 70). Ascends to 

 the summits of Cam Tual and Beenkeragh, and descends to sea- 

 level (H. C. Hart). 



96. Rumex acetosella, L. Common on the mountains of the 

 Breadalbane district, up to 1006 m. ("Fl. Perthsh." 261). Summit 

 of Ben Lawers, where, however, " it rarely flowers " (R. Brown, 

 1794, in Herb. Brit.). Ascends to the summit of Carn Tual 

 (H. C. Hart). Descends to sea-level in Cork. 



97. Oxyria digyna, Hill. Ascends to 1190 m. on Ben Lawers 

 ("Fl. Perthsh." 262). Ben Lawers (Herb. Brit, ex herb. Gourlie, 

 1841). Ascends to 1216 m. on the Grampians of Aberdeenshire 

 (Watson). Descends to 168 m. in Kerry. Summit of Snowdon 

 (Herb. Brit, ex herb. Mrs. Robinson). 



98. Polygonum viviparum, L. Ascends to the summit of Ben 

 Lawers (Watson, " Geogr. Distrib. Brit. PL" [1835], 73; Hamilton, 

 in Herb. Brit.). Descends to 150 m. in Sligo. 



Fam. 27. SALICACE^E. 



99. Salix caprea, L. Attains a higher level in Scotland than 

 any of the other tree-willows, but falls far short of 1000 m. Common 

 in woods and on river-banks, it ascends to 610 m. on hills of the 

 Atholl district of Perthshire, which is the limit of its altitudinal 

 range in Britain. The sallow descends to sea-level in Cork. 



TOO. Salix Lapponum, L. Ascends to 1130 m. on Loch-na-gar 

 (Dickie). A really alpine willow which rarely descends below 610 

 m. by mountain rocks and streams. 



1 01. Salix myrsinites, L. On mountain ledges high up on Ben 

 Achallader ; the first reference in this List to this mountain. First 

 recorded as a British plant, " upon the Highland mountains, as upon 

 Ben-Achulader, in Glenurchy," by J. Stuart (Lightfoot, " Fl. Scotica/' 



ii- [i777], 599)- 



102. Salix herbacea, L. One of the most abundant plants 

 towards the summits of nearly all the Highland mountains which 

 exceed 730 m. in height (" Cyb. Brit." ii. 407). Common on 

 ledges and ridges on many of the higher mountains (F. B. White). 

 On" the summit of Cairn Gorm of Derry (Dr. J. W. H. Trail). 

 On the summits of the loftiest mountains ... in a micaceous soil 

 (Smith, "English Fl." iv. 200). Ascends to the summit of 

 Ben Lawers (" Fl. Perthsh." 279), and of Ben Macdhui (Watson, 

 1832, in Herb. Kew.). Ascends to 1026 m. on Ben Nevis 



