P 1 y g on a c e a e JUSS. 



Koenigia islandica L. Mant. I (1767) p. 35; Ledeb. Fl. Alt. I, p. 124; Turczan. Cat. 

 Baical. no. 992; Ledeb. Fl. Ross. Ill, p. 535; Turczan. Fl. Baical.-Dahur. (1852, IV) p. 

 462, no. 993; Herder, PI. Radd. (1892) p. 212, no. 69; KptuL. $j. Ajit. V (1909) p. 1171. 



In moist, grass-grown places, near a mountain brooklet in the Altaian, at an alti- 

 tude of about 1900 m. above sea4evel. Flowering at the end of July. 



Distribution: Arctic regions of Europe (Iceland, the Faroe Islands, Spitzbergen, Jan 

 Mayen, Beeren Eiland, Novaya Zemlya, Norway, northern Sweden, northern Russia), 

 northern Siberia (in the Yenisei valley, northwards past 70° north latitude), the Altai, 

 the Sayansk district, the Himalayas, North America, Greenland, Tierra del Fuego 

 (Dus^N, Skottsberg). 



Polygonum aviculare L. Spec. PI. ed. II (1762) p. 519; Lindman in Svensk Botan. 

 Tidsskrift VI (1912) p. 673; Ledeb. Fl. Alt. II, p. 85; Turczan. Cat. Baical. no. 977; Karel. 

 t;t Kiril. Enum. PI. Fl. Alt. no. 790; Ledeb. Fl. Ross. Ill, p. 531; Turczan. Fl. Baical- 

 Dahur. (1852, IV) p. 461, no. 992; Herder, PI. Radd. (1892) p. 214, no. 72; Meisner, 

 Monogr. Gen. Polyg. p. 87, no. 95; Kpti.i. $ji. Ajit. V (1909) p. 1169. 



Very common in the territory explored, along road-sides, near habitations, in court- 

 yards, in moist places about the river Abakan, Minusinsk, Karatus, Kushabar, in farm- 

 yards, and the like, of settlements in the taiga, at Ust Algiac, Ust Sisti-kem, the Kamsara, 

 Tara-kem, Cha-kul and Ust Uss. The species varies considerably. The following forms 

 appear to be common from the structure of the vegetative shoots: a procumbens Hayne, 

 Ledeb. 1, c, /S erectum Ledeb, 1. c, and d vegetum Ledeb. 1. c. However, as ripe fruits 

 are wanting in the specimens collected, an exact determination of this material is at 

 present hardly possible. 



Distribution: Nearly all over the globe. 



Polygonum dumetorum L. Spec. PI. ed. II (1762) p. 522; Ledeb. Fl. Alt. II, p. 82; 

 lurczan. Cat. Baical. no. 970; Ledeb. Fl. Ross. Ill, p. 528; Turczan. Fl. Baical.-Dahur. 

 (1852, IV) p. 457, no. 984; Meisner, Monogr. Gen. Polyg. p. 63, no. 32; Herder, PI. Radd. 

 (1892) p. 258, no. 92; Kpi.M. c&jr. Ajit. V (1909) p. 1169. 



On slopes and in open woods of foliferous trees, near Kushabar. In full flower in 

 the middle of July. 



Distribution: Europe, south-western Asia to Turkestan, Afghanistan, the western 

 Himalayas, the Ea|st Indies, Siberia, eastern Asia, SakahaHn, North America (intro- 

 duced?). 



Polygonum Convolvulus L. Spec. PI. ed. II (1762) p. 522; Ledeb. Fl. Alt. II, p. 

 81; Turczan. Cat. Baical. no. 969; Karel. et Kiril. Enum. PL Fl. Alt. no. 785; Ledeb. Fl. 

 Ross. Ill, p. 528; Turczan. Fl. Baical.-Dahur. (1852, IV) p. 456, no. 983; Meisner, Monogr. 

 Gen. Polgg. p. 63, no. 30; Herder, PI. Radd. (1892) p. 255, no. 91; Meisner, Polyg. Haute- 

 Asie p. 349 (16); Kpu.i. ipji. Ajit. V (1909) p. 1168. 



202 



