Peninsula and Kanilcliatka, noilhwards 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; Ledeh. Fl. Ross. II, p. 920; Turczan. 

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

 Rhododendr. Asia.e Orient. (1870) p. 20; Kptu. (Jji. A.n. II (1904) p. 791: E.Bymi,, Ericaceae 

 BT. (t>A. Ciioiip. II J[-AJihn. BocT. II (1915) p. 15; KyaHemiBT>, BepecKOBbia b-b ^e^ieHKo, $.1. AsiaT. 

 PoccIh 9 (1916) p. IH. R. flavuin Pallas, 1. c. p. 320. 



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

 altitudes of about 2000 to 2100 m. above sea-level. Especially gi'owing on 4ry and sunny 

 decli^ities with a southern aspect, covered with mosses and lichens, associated with 

 plants as Gentiana algida and G. altaica. Drijas octopeiala, 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 soutliern Siberia and 

 northern Mongolia to Kamtchatka, Sakhalin, North America. 



Rhododendron \nthopogon Don in Mem. Wern. Soc. Ill (1821) p. 409; Don, Pro- 

 drom. Fl. Nepal. (1825) p. 153; E.Byun., Ericaceae B-h^^.x. Ciump. n ,T;a.ibn. Roct. II(191~5) p. 19; 

 KysHeuoBT., BepecKOBi.ia wh Ocatohko, ^.1. Aniiix. Pucciii 9 (1915) p. 13. Osnwthanmus fragrans 

 DC. Prodrom. VII (1839) p. 715; Ledeb. Fl. Ross. II, p. 918. 0. 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. Sdc. 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. Byun,, Ericaceae bt, 

 $ji. Ciionp. n JIfl.nAi. 1!(h-t. II (1915) p. 22. R. lapponicnm (L.) Wahlenb. var. parvifolium 

 (Adams) Herder, PI. Radd. (1872) p. ;U;3; Kyimcuoi!!.. 1>c|k'ci,(iiimii m> tlvjueuKu, (l>.i. A;^iuT. 

 Poccin 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 



