Polygonum viviparum L. Spec. PI. ed. II (1762) p. 516; Ledeb. Fl. Alt. II, p. 78; 

 Turczan. Cat. Baical. no. 966; Ledeb. Fl. Ross. Ill, p. 519; Turczan. Fl. Baical.-Dahur. 

 (1852, IV) p. 451, no. 977; Meisner, Monogr. Gen. Pohjg. (1826) p. 52, no. 5; Meisner, 

 Polyg. Haute-Asie, p. 347, no. 13; Herder, PI. Radd. (1892) p. 240, no. 85; KptM. Ojt. 

 A.IT. V (1909) p. 1161. 



This species, being very common in moist meadows on the islets in the rivers 

 Yenisei and Abakan, in the Amyl taiga, and the Urjankai country, varies considerably 

 in size and habitus, breadth of leaves, etc. There are to be found forms in which the 

 leaves are quite smooth underneath, and others with the under side of the leaves rather 

 densely pubescent. There are, however, between the various forms, marked intermediates. 



On islets in the river Abakan, near Askys, I have collected a vigorous form, from 

 40 to 45 cm. high, with narrow, lanceolate, long-petioled radical leaves, to 12 cm. long, 

 and 2,5 cm. broad. Probably belonging to f. elongatum. Beck in Reichenb. Icon. XXIV 

 (1906) p. 84. Similar vigorous forms, with broader radical leaves, are common in the 

 Urjankai country, and abundant, for instance, between the Algiac Pass and Ust Algiac, 

 as well as on the Kamsara. 



In the Altaian, at an altitude of about 2000 m. above sea-level, I have collected a 

 slender form, with quite smooth and very narrow leaves, only 0,3—0,5 cm. broad. 



Distribution: Europe, and arctic islands, Caucasia, south-western and central 

 Asia, Siberia, northwards to Taimyr (75° north latitude), northern Mongolia, eastern 

 Asia, Sakhalin, North America, Greenland. 



Polygonum Bistorta L. Spec. PI. ed. II (1762) p. 516; Ledeb. Fl. Alt. II, p. 77; 

 Turczan. Cat. Baical. no. 965; Karel. et Kiril. Enum. PI. Fl. Alt. no. 783; Ledeb. Fl. 

 Ross, m, p. 518; Turczan. Fl. Baical.-Dahur. (1852, IV) p. 450, no. 976; Meisner, Monogr. 

 Gen. Polyg. p. 51; Herder, PI. Radd. (1892) p. 245, no. 86; Kptijc. $jr. Ajit. V (1909) 

 p. 1160. 



Common in moist meadows, and on river-banks in the lower parts of the river 

 Abakan, as well as near Kushabar, Ust Algiac and Ust Sisti-kem. Collected with flowers 

 at Ust Abakan at the end of June, and with ripe fruits at Kushabar, about the middle of 

 July. The specimens belong to f. laiifolium Hayne, Arzney-Gew. V (1817) p. 19. 

 Polygonum bisiorla a vulgaris Meisner, I. c. 



Besides, I have collected, near Kushabar, some specimens of a vigorous form, 

 especially characteristic in having the under side of the leaves of a rusty brown colour. 

 These specimens, therefore, are probably identical with specimens reported by Ledebour 

 in Fl. Ross. Ill, p. 519 «foliis laiioribus, subtus parcius pilosis subferrugineis; pilis sub- 

 rufis. — In pfovinciis Caucasicis et terris boreali-orientalibus.» The form in question 

 has the leaves underneath wholly and densely pubescent, of a rusty brown colour, giving 

 the under side of the leaves a dark brown, frequently nearly felted or velvet-like appea- 

 rance. I separate this characteristic form, the distribution of which seemed to be confined 

 to easterly regions, as 



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