Pyrola uniflora L. Spec. PL ed. II (1762) p. 568; Ledeb. Fl. Alt II, p. 98; Bunge, 

 Enum. Alt p. 19; Turczan. Cat Baical. no. 747. Moneses grandiflora Salisb. in Gray 

 Nat Arrang. II (1821) p. 403; Turczan. Fl. Baical.-Dahur. (1848) p. 508, no. 755; Ledeb. 

 Fl. Ross. II, p. 931; tierder, PI. Radd. (1872) p. 369, no. 62; KpBiJi. $j£. Ajit. II (1904) p. 800. 



Pretty common in the Amyl valley, at Ust Algiac, and on the Sisti-kem, where I have 

 collected it in spruce- and cedar-forest, among mosses. In full flower at the end of July. 



Distribution: Europe, except the extreme south, throughout Siberia, northwards 

 to about 65° north lat., eastwards to the Tshuktsher Peninsula and thei Amoor Pro- 

 vince, the Thian-Shan, northern Mongolia, China, Manchooria, northern Japan, North 

 America, Greenland. 



Ericaceae J)C. 



Ledum palustre L. Spec. PI. ed. II (1762) p. 561; Ledeb. Fl. Ah. II, p. 97; Turczan. Cat 

 Baical. no. 746; Karel. et Kiril. Enum. PI. Fl. Alt no. 753; Ledeb. Fl. Ross. II, p. 923; Tur- 

 czan. Fl. Baical.-Dahur. (1848) p. 503, no. 751; Maxim. Rhododendr. Asiae Orient. 

 (Mem. Acad. Imper. Sc. St Petersbourg Ser. VII, T. XVI, 1870) p. 49; KpBur. $je. Ajit. Ill 

 (1904) p. 793; E. Bymi., Ericaceae bt. $jt. Ch5hp. h ^ajEbH. Boct. II (1915) p. 3; KyBHenoBi., 

 BepecKOBtia bi. $eftieHKO, <&ji. AsiaT. Poccin 9 (1916) p. 6. 



This species occurs in Siberia in 4 rather distinct varieties,- of which the following 

 3 are found by me in the territory traversed: 



var. vulgare Ledeb. Fl. Ross. 1. c; E.Bymrb, 1. c.p. 7; KysHeAOE'i., 1. c. p. 8, L. palustre 

 a genuina Herder, PI. Radd. (1872) p. 352, no. 52. 



This variety seemed to be the most common one* and is to be met with especially 

 in moist and boggy, frequently moss-grown places in subalpine coniferous woods. I have 

 by the way, collected or observed this one in the following localities: Near Kalna, at Ust 

 Algiac, where rather common in the turfy bogs, at Tshebertash, in moist, moss-grown 

 ground in woods, near the Sisti-kem, at Ust Sisti-kem, and further on downwards along 

 the banks of the Bei-kem, in the taiga territory to about the neighbourhood of Buluk, 

 where the forests of conifers cease, and the climate becomes drier. In this variety, and 

 generally also in the following ones, the three youngest year's shoots are leaf-bearing; in 

 branches 4 years old, however, the leaves have fallen off. The youngest year's shoots 

 are densely felted, the older ones gradually becoming more glabrate. The length of the 

 year's shoots in this variety is generally from about 8 to 12 cm. Taken flowering and with 

 fruits in July and August. 



var. angustiim E. Busch, 1. c. (1915) p. 8. L. palustre var. decumbens Maxim. Rhodo- 

 denr. Asiae Orient (1870) p. 49. L. palustre fi angustifoliunjHerder, PL Radd. (1872) p. 353. 



This one differs from the preceding variety in having the leaves narrower, with 

 much revolute margins, and seemed mostly to occur in soil, drier and hotter as regards 

 physiological conditions. I have, by the way, found it in the wooded steppe region at Ust 

 Sisti-kem, in wood of pine and larch, on sandy heath, associated with Rhododendron 

 parvifolium, Vaccinium vitis idaea, etc. 



338 



