19231 WILSON, THE RHODODENDRONS OF NORTHEASTERN ASIA 4t 



There is said to be a white-flowered variety 



Rhododendron parvifolium var. albiflorum Herder apud Maximowicz 

 in Mem. Acad. Sci. St. Petersb. ser. 7, xvi. no. 9, 17 (Rhod. As. Or.) (1870). 



This is described as very densely branched with shorter pedicels and 



white flowers. 



Mt 



of the Irkut River, which is west of the southern end of Lake Baikal, by 

 Gustave Radde between 1855 and 1857. It appears to be unknown in 

 gardens. 



Sect. 3. POGONANTHUM G. Don 



Rhododendron sect. Pogonanthum G. Don, Gen. Syst. in. 845 (1834) 



Rhododendron sect. Osmothamnus Maximowicz in Mem. Acad. Sci. St 

 Petersb. ser. 7, xvi. no. 9, 14 (Rhod. As. Or.) (1870), in part. 



Represented by 7. R. Adamsii. 



Rhododendron Adamsii Rohdcr in Wilson & Rehder, Monog. Azal. 190 



(1921). 



Azalea fragrans Adams in Mem. Acad. Sci. St. Petersb. n. 332, t. 14 (1808). 

 Osmothamnus fragrans De Candolle, Prodr. vn. 715 (1839).— Ledebour, 



Fl. Ross. ii. 918 (1846), exclud. synon. 

 Osmothamnus pallidas De Candolle, 1. c— Ledebour, 1. c, exclud. synon. 

 Rhododendron fragrans Maximowicz in M6m. Acad. Sci. St. Petersb. ser. 



7, xvi. no. 9, 16 (Rhod. As Or.) (1870), not Paxton— Balfour f. in Millais, 



Rhodod. 171 (1917). 

 Rhododendron pallidum Dummer in Card. Chron. ser. 3, LIU. 264 (1913), 



not W. Watson 



Shrub 0.2-0.5 m. tall, with verticillate, erect branches densely villose 

 when young and clad with fulvous lepidote scales. Leaves persistent, lepi- 

 dote, short-pctioled, coriaceous, elliptic to elliptic-ovate, 1.4-2 cm. long, 0.6- 

 0.8 cm. wide, acute, obtuse at base, margin incurved, dark green above, 

 fulvous beneath. Flowers pink or white, 7-15, crowded together in a 

 terminal racemose corymb; pedicels 1-2 mm. long, lepidote; calyx saucer- 

 shape, 5-toothed, the teeth unequal, ovate to deltoid, 1-2.5 mm. long, 

 often ciliate; corolla salver-shape, 5-lobed, tube about 8 mm. long, glabrous 

 without, villose within, lobes spreading, rounded; stamens 5, included, 

 filaments puberulous at base; pistil shorter than stamens, ovary ovoid, 

 furrowed, villose and lepidote, style stout, club-shape, stigma lobed. 

 Fruit conic, villose, lepidote. 



Habitat, Eastern Siberia, Baikal region north-eastward to the valley of 

 Lena River. 



This plant is unknown to me and does not appear to have been intro- 

 duced into gardens. It seems to be confined to the regions mentioned 

 above and not to reach the coast. The Himalayan R. anthopogon D. Don 

 has been confused with Adams' plant but the two species are quite distinct. 

 Several other distinct plants from western China and the Himalayas have 

 been erroneously referred to R. Adamsii but this plant is unknown 



