Peninsula and Kamtchatka. northwards to Taimur, 73° 30' north lat., northern Mongolia 

 (the Sayansk district), Manchooria Corea, Sakhalin, Japan, North America, Greenland. 



Rhododendron chrysanthum Pallas, Reise Russ. Reich. Ill (1776) p. 318, 352, 369, 

 449, Anh. p. 729, no. 87; Turczan. Cat. Baical. no. 744; Ledeb. Fl. Ross. II, p. 920"; Turczan. 

 Fl. BaicaL-Dahur. (1848) p. 499, no. 748; Herder, PI. Radd. (1872) p. 345, no. 46; Maxim. 

 Rhododendr. Asiae Orient. (1870) p. 20; KpBM. "Sji. Ajit. II (1904) p. 791; E.Byinrb, fincaceae 

 Bi) $j[. Ch5hp. h JI^ajEBH. BocT. II (1915) p. 15; KysnenoBi., BepecKOBbiH Bt ^eRiemto, $ji. AsiaT. 

 PocciH 9 (1916) p. 18. R. flavum Pallas, 1. c. p. 320. 



This species I have met with in the Altaian, above the limit of tree vegetation, at 

 altitudes of about 2000 to 2100 m. above sea-level. Especially growing on dry and sunny 

 declivities with a southern aspect, covered with mosses and lichens, associated with 

 plants as Gentiana algida and G. altaica, Dryas octopetala, Viola altaica, and others; in 

 some places occurring so abundantly as to form a nearly impenetrable underwood to 1 

 m. high. Specimens taken at the end of July are nearly past flowering, with ripe and 

 partly ripe capsules. 



Distribution: From the Altai and the Sayansk district through southern Siberia and 

 northern Mongolia to Kamtchatka, Sakhalin, North America. 



Rhododendron Anthopogon Don in Mem. Wem. Soc. Ill (1821) p. 409; Don, Pro- 

 drom. Fl. Nepal. (1825) p. 153; E.Bymi., Ericaceae bi. Oje. CnSap. h /^ajEtn. Bocx. 11(1915) p. 19; 

 KysHeuoB'B, BepecKOBtia bi. ^effieHKO, $ji. Asiax. Poccia 9 (1915) p. 13. Osmothamnus frag runs 

 DC. Prodrom. VII (1839) p. 715; Ledeb. Fl. Ross. II, p. 918. O. pallidas DC. Prodrom. VII 

 (1839) p. 715; Ledeb. Fl. Ross. II, p. 918; Turczan. Fl. Baical.-Dahur. (1848) p. 498, no. 

 747. R. fragrans Maxim. Rhododendr. Asiae Orient. (1870) p. 16; Herder, PI. Radd. (1872) 

 p. 341, no. 44. Azalea pallida Turczan. Cat. Baical. no. 745. 



var. fragrans (Maxim.) Kusnezow, 1. c. (1915) p. 15. 



In the Altaian, above the limit of tree vegetation, at an altitude of about 2000 m. 

 above sea-level, in stony places, among mosses and lichens. Nearly past flowering at the 

 end of July. 



Distribution: The species is distributed in north-eastern Russia (Petshora), the 

 Sayansk district. Trans Baikal, scattered in north-eastern Siberia to Kamtchatka, north- 

 ern Mongolia, the Himalayas. 



Rhododendron parvifolium Adams in Mem. Soc. Natur. Moscou IX (1834) p. 237; 

 Turczan. Cat. Baical. no. 743; Ledeb. Fl. Ross. II, p. 921; Turczan. Fl. Baical.-Dahur. (1848) 

 p. 500, no. 749; Maxim. Rhododendr. Asiae Orient. (1870) p. 17; E. Byiui., Ericaceae bi. 

 $ji. CnSirp. H /l^ajiBH. Bocx. II (1915) p. 22. R. lapponicum (L.) Wahlenb. var. parvifolium 

 (Adams) Herder, PI. Radd. (1872) p. 343; Ky-giieuoBT,, BepecKOBbm bi> ^eAieHKO, $ji. Asiax. 

 PocciH 9 (1916) p. 16. 



Scattered in pine- and larch-woods between Ust Sisti-kem and the Kamsara. Past 

 flowering in the middle of August. 



340 



