Distribution: Arctic and alpine regions of Europe, (southwards to the Pyrenees, 

 Alps, Caipathian mountains), Iceland, Spitzbergen, Novaya Zemlya, arctic Siberia, 

 between about 675^° — 733^° north latitude (Dickson Harbour), and eastwards to Kamt- 

 chatka, the Altai, the Sayansk district, Baikal and Trans Baikal mountains, northern 

 Mongolia, arctic America, Greenland. 



Salix pyrolaefolia Ledeb. Fl. Alt. IV, p. 270; Turczan. Cat. Baical. no. 1036; Ledeb. 

 Fl. Ross. Ill, p. 613; Anderss. Monogr. Salic. I (1867) p. 169, no. 101; Turczan. Fl. Baical- 

 Dahur. (1854, I) p. 385, no. 1036; Bojii.4)i., Hbbi EBpon. PoccIhII, p. 106; KpBi.i. <C>ji. Ajit. 

 V (1909) p. 1221. 



In moist meadows, near the banks of the Upper Sisti-kem. 



Distribution: Northern Russia, Siberia, northern Mongolia. 



Salix cinerea L. Spec. PI. ed. II (1763) p. 1449; Wimmer, [Salic. Europ. p. 47; 

 Anderss. Monogr. Salic. I (1867) p. 71, no. 44; Ledeb. Fl. Ross. Ill, p. 607; Herder, PI. 

 Radd. (1892) p. 400, no. 137; Bo-it^i,, IIbbi EBpon. PoccIh II, p. 72; Kptui. $ji. Am. V 

 (1909) p. 1213. 



In moist meadows, on an islet in the river Abakan, near Ust Kamuishto. With 

 nearly ripe capsules in the second half of June. 



Distribution: Europe, the Caucasus, Asia Minor, Persia, Russian Turkestan, 

 through Siberia and middle Asia to Kamtchatka, eastern Asia and northern Corea, 

 Sakhalin, North Africa. 



Salix fragilis L. Spec. PI. ed. II (1763) p. 1443; Wimmer, Salic. Europ. (1866) p. 

 19; Anderss. Monogr. Salic. I (1867) p. 41, no. 28; Ledeb. Fl. Ross. Ill, p. 598. 



Some specimens of this one observed by me in the Amyl valley, near Kushabar. 



Distribution: Europe, south-western Asia, western and middle Siberia, eastwards 

 about to the Baikal, America (introduced). 



Betula rotundifolia Spach, Rev. Belulac. in Ann. Sc. Nat. Ser. II (1841) p. 194; Cyita- 

 TOBT., Kt. Chct. Ch6. Bepe3i.— Bt Tpy/i,. Bot. Mys. Ahhk- HayKt (1911) p. 215. Betula glandulosa 

 Michx. Fl. Bor. Amer. E (1803) p. 180; Herder, PI. Radd. (1892) p. 64; Winkler, Belu- 

 lac. in Engl. Pilanzenr. H. 19 (IV, 61, 1904) p. 73. Betula nana in Ledeb. Fl. Alt. IV, p. 246; 

 Turczan. Cat. Baical. no. 1062; Turczan. Fl. Baical.-Dahur. (1854, I) p. 403, no. 1061; 

 KpMji. <3>jr. Ajit. V (1909) p. 1250. Betula nana /9 sibirica Ledeb. Fl. Ross. Ill, p. 654. 

 Betula nana /S sibirica et ;' intermedia Regel, Monogr. Betulac. (1861) p. 43, 44. 



Common in the Sayansk district, in subalpine and alpine regions, up to about 

 2000 m. above sea-level, in moist as well as in drier situations. It appears from the 

 material collected that the species varies considerably in the form and size of the 

 leaves, from 1 to 2 cm. in diameter, as well as in the shape of the teeth. The form of 

 pistillate catkins varies between ovoid and subcyUndrical. Collected with nearly ripe 

 fruits at the end of August. 



197 



