Salicaceae KK'H. 



Populus lauiifolia Ledeb. Fl. Alt. IV, p. 297; Ledeb. Fl. Ross. Ill, p. 629: Kptu. <D.i. 

 A.iT. V (1909) p. 1238. Populus balsamifera L. var. laurifolia Wesmael, Monogr. Gen. 

 Populus p. 65, no. 16; Herder, PI. Radd. (1892) p. 464, no. 189. 



Yerv common on the banks and on the islets in the Yenisei and the river Abakan. 

 Equally frequent in the Urjankai couniry. along the Bei-kem and liie Ulu-kem. where, 

 in the steppe regions, accompanying the following, constituting the bulk of the scarce 

 tree vegetation along the banks. Found Avith nearly ripe fruits at the end of June. 



Distribution: Southern Siberia, northwards to about 64^" north latitude, where 

 appearing as a shrub, only a few feet high, and eastwards to the government of Yeni- 

 seisk, northern Mongolia, Turkestan, Dzungaria. 



Populus tremula L. Spec. PI. ed. II (1763) p. 1464: Ledeb. Fl. Alt. IV, p. 296; 

 Turczan. Cat. Baical. no. 1056: Ledeb. Fl. Ross. Ill, p. 627; Turczan. Fl. Baical.-Dahur. 

 (1854, I) p. 398, no. 1054; Wesmael. Monogr. Gen. Populus p. 49, no. 4; Herder, PI. Radd. 

 (1892) p. 460, no. 188; K].i,i.i. «I).i. .V.rr. V (1909) p. 1236. 



Common in the regions a])out the Yenisei and the river Abakan, scattered between 

 Minusinsk and Kushabar, in subalpine wood regions about the Amyl. Also vei-y com- 

 mon in the Urjankai country, for instance at I'st Algiac. the Kamsara, and on the banks 

 of the rivers Bei-kem and Ulu-kem. In the Amyl taiga, south of Kushabar, forming 

 groves of mighty, straight, branchless trunks, from 25 to 30 m. high, the summit only 

 being furni.shed with a crown. In the Altaian, on the mountains, it does not seem to 

 ascend so high as the conifers. Past flowering already in tlie middle of June. 



Distribution: Europe, except the south-western portion of the Pyrenean Peninsula, 

 Caucasia, Asia Minor, Russian Turkestan, Siberia, northwards to about 66° north lati- 

 tude, northern Mongolia, eastern Asia, Sakhalin, North Africa. 



Populus nigra L. Spec. PI. ed. II (1763) p. 1464; Ledeb. Fl. Alt. IV, p. 296; Ledeb. 

 Fl. Ross. 111. p. 628; Herder, PL Radd. (1892) p. 466, no. 190: h'l.r.T.i. <I'.t. A.it. V (1909) 

 p. 1237. 



Common on the banks of the Yenisei and Abakan rivers, and in moist meadows 

 on the islets in the said rivers. Taken with partly ripe fruits in the second half of June. 

 Scattered along the Bei-kem and the Ulu-kem. 



Distribution: Europe, except the northern portions, (Scotland, Ireland, Scandina- 

 via, northern Russia), south-western Asia to the Himalayas and Russian Turkestan, 

 Siberia, northwards to 63° 15' north latitude, and eastwards to the government of 

 Yeniseisk. 



Salix pentandra L. Spec. PI. ed. II (1763) p. 1442; Anderss., Monogr. Salic. I (Kgl. 

 Svenska Ventenskaps. Acad. Handl. VI (1867) p. 35; Wimmer, Salic. Europ. (1866) p. 22; 

 15o.Ti,(|)'i, JMaTep. n.m iiayiieniii iib'b jjacTviu.irx'L aiikouT) Eispon. Pocciii I-b-b IIsb. IIjiiiepaT. C. IleTepG. 

 •Ijjcu. IIhctiit. IV (1900) ii. 17; BoJib4)'i>, Maxep. 3,.ifi iiay^i. hb-b Aaiax. Pocciii I-b'l TpyA. C. nexepo. 



190 



