Distribution: Europe, Caucasia, Trans Caucasia, the Himalayas, India, Ceylon, 

 Siberia, eastern Asia, South America, Australia. 



Polygonum hydropiper L. Spec. PI. ed. II (1762) p. 517; Ledeb. Fl. Alt. II, p. 84; 

 Turczan. Cat. Baical. no. 981; Ledeb. Fl. Ross. Ill, p. 523; Turczan. Fl. Baical.-Dahur. 

 (1852, IV) p. 460, no. 990; Herder, PI. Radd. (1892) p. 224, no. 78; Meisner, Monogr. Gen. 

 Polyg. p. 76; Kptur. Oji. Ajit. V (1909) p. 1165. 



On moist banks on the river Abakan, near Ust Abakansk. With young flower- 

 buds in the middle of June. 



Distribution: Europe, except the arctic regions, the Caucasus, south-western Asia 

 to Turkestan and the Himalayas, Siberia, eastern Asia, Sakhalin, Japan, India, Java, 

 North Africa, North America, Australia. 



Polygonum tomentosum Schrank, Baier. Fl. I (1789) p. 669. Polygonum lapathifo- 

 Uum L., Ledeb. Fl. Alt. II, p. 83; Turczan. Cat. Baical. no. 980; Karel. et Kiril. Enum. 

 PI. Fl. Alt. no. 787; Ledeb. Fl. Ross. Ill, p. 321; Turczan. Fl. Baical.-Dahur. (1852, IV) 

 p. 458, no. 987; Meisner, Monogr. Gen. Polyg. p. 69, no. 41; Meisner, Polyg. Haute-Asie 

 p. 345 (12); Herder, PI. Radd. (1892) p. 236, no. 83; KpBiJi. «D.i. Ajit. V (1909) p. 1163. 



As weeds in fields and moist meadows, here and there between Minusinsk and 

 Kushabar, as well as on sandy river-banks on the river Abakan, near Ust Abakansk. 

 With young flowers at the end of June. 



Distribution: Europe, Caucasia, and south-western Asia to Turkestan and the 

 Himalayas, Siberia (in the Yenisei valley, northwards to 70° 20' north latitude), northern 

 Mongolia, eastern Asia, Sakahalin, Japan, India, North Africa, North and South America 

 (introduced), Australia (introduced). 



Polygonum amphibium L. Spec. PI. ed. II (1762) p. 517; Ledeb. Fl. Alt. II, p. 82; 

 Turczan. Cat. Baical. no. 982; Karel. et Kiril. Enum. PI. Fl. Alt. no. 786; Ledeb. Fl. 

 Ross. Ill, p. 520; Turczan. Fl. Baical.-Dahur. (1852, IV) p. 458, no. 986; Meisner, Monogr. 

 Gen. Polyg. p. 67, no. 39; Meisner, Polyg. Haute-Asie p. 344 (11); Herder, PI. Radd. 

 (1892) p. 228, no. 80; KpBui. $ji. Ajit. V (1909) p. 1162. 



Rather common in the territory explored, where — in point of habitat's — noted 

 as f. aquaticum Leyss. (Fl. Hal. (1761) p. 391) and f. terestre Leyss. (1. c. p. 391). 

 The leaves of the latter form bear rather stiff, straight hairs, never glandular in the 

 specimens gathered. The former of the two occurs in still creeks, and the like, along 

 the rivers Yenisei and Abakan, at Askys, Ust Kamuishto, Uibat, and Ust Abakansk, on 

 the Amyl, near Kushabar, at Ust Sisti-kem, as well as in creeks and branches of the 

 Bei-kem, in swamps on the Dora Steppe. 



The latter f. ierrestre Leyss. collected by me near Ust Kamuishto and Uibat, on 

 moist banks, bearing leaves onlj^ at the end of June. 



Distribution: Europe, Caucasia, south-western Asia to Turkestan and the Hima- 

 layas, Siberia, northwards to about the arctic circle, northern MongoUa, eastern Asia, 

 Sakhalin, the East Indies, North and South Africa, North America. 



204 



