250 ANNALS OF SCOTTISH NATURAL HISTORY 



Fam. 14. OXALIDACE/E. 



40. Oxa/i's acetosella^ L. — Among rocks and stones up to 1160 

 m. in the Breadalbane district (" Fl. Perthsh." 96). Descends to 

 sea-level in Cork. 



Fam. 15. Empetrace^. 



41. Empetrum 7iigruin^ L. — On upland moors; ascends to the 

 summit of Schiehallion (" Fl. Perthsh." 97). Ascends to 1250 m. 

 on Ben Macdhui (Watson, " Outlines Geogr. Distrib. Brit. Plants," 

 1832, p. 270, — " I saw a specimen at an elevation of 4100 feet"). 

 Ascends to 1067 m. " on the western declivity of the Ben Nevis 

 Range " (Watson, I.e.) ; and to 1037 m. on Ben-na-Bourd (Watson, 

 1844, in Herb. Kew.). Ascends to the summit of Beenkeragh 

 (Hart, 1881, in " Proc. Roy. Irish Acad." 1882, p. 578). Griffith 

 (" Fl. of Anglesey and Carnarvon," 126) says that it is "common 

 along the Snowdonian range in many places," such as the summit of 

 Glyder Fawr, w^hose peak is two metres short of a thousand : there 

 is also a specimen from Snowdon in Herb. Brit. (Mitford), but the 

 height is not stated. Descends to sea-level in Kerry. 



Fam. 16. EUPHORBIACEiE. 



42. Mercurialis perennis., L. — Ascends to 1006 m. in stony 

 places on the mountains of the Breadalbane district (" Fl. Perthsh." 

 263). Descends to sea-level in Antrim. 



Fam. 17. ViOLACE/E. 



43. Viola palustris, L. — Ascends to 1174 m. on Ben Lawers 

 ("Fl. Perthsh." 71), in marshy places. Ascends to 1037 m. on 

 Ben-na-Bourd (Watson, 1844, in Herb. Kew.); and to 1220 m. 

 on Ben Macdhui (Dickie, 18). Descends to sea-level in Cork. 



44. Viola lutea, var. amoe?ia, Henslow, subvar. i?tsig?tis, Baker f. 

 in " Journ. Bot." 1901, 222. — "Rocks, somewhat moist, at very 

 considerable heights on Ben Lawers" (R. Brown, 1794, in Herb. 

 Brit.). Cliffs of Ben Lawers (G. C. Druce, 1888). According to 

 Dr. White the var. a7noena is found on alpine rock-ledges of the 

 mountains of the Breadalbane district up to 1052 m. (" Fl. Perthsh." 

 73). He also says: "The petals vary much in shape. In the 

 most alpine plants the lower petal is apiculate ; in those from a 

 somewhat lower altitude the lower petal is repand-crenate, thus 

 resembling the description of the var. sudetica, Koch ( V. sudetica, 

 Willd.)." 



The following characters distinguish this plant from the typical 

 form of V. hitea, var. avK^na \ — Caulis 5-15 cm. Lamina foliorum 

 infimorum orbicularis petiolo multoties longior basi rotundata vel 

 subcuneata, margine crenato-serrata ; lamina foliorum superiorum 



