ENUMERATION OF THE SPECIES 89 



1917, E. H. Wilson (No. 9592); Fusan, September 11, 1905, J. G- 

 Jack; prov. Keiki, East Park palace, Seoul, September 24, 1905, 

 J. G. Jack; Government Forestry Garden, Seoul, cultivated, May 21, 

 1917, E. H. Wilson (No. 8431); Kazan, near Suigen, May 24, 1917, 

 E. H. Wilson (No. 8472); prov. Kogen, Diamond Mts., July 7, 1918, 

 E. H. Wilson (No. 10,493); prov. South Kankyo, hills round Gensan 

 (Wonsan), September 5, 1903, C. S. Sargent; between Shinkori and 

 Eiko, September 20, 23, 1917, E. H. Wilson (Nos. 9201, 9223); prov. 

 North Heian, altitude 300-1000 m. June 16, 1917, E. H. Wilson 

 (No. 8603); province unknown, " Pomasa," altitude 800 m. May 21, 

 1906, U. Faurie (No. 66^) ; " Hoangheito," August, 1906, U. Faurie 

 (No. 668); northeast coast, 1854, Baron A. Schlippenbach (Herb. Gray). 



Northeast Manchuria: shores of Possiet Bay, 1860, C. Maxi- 

 mowicz (Herb. Gray). 



Japan: Hondo, prov. Ugo, Chokai-san, June 15, 1903, K. Sakurai. 



Cultivated: Arnold Arboretum (No. 7258). 



This is one of the commonest shrubs in Korea and in thin woods is often the 

 dominant undergrowth. It just crosses the border into northeast Manchuria on 

 the shores of Possiet Bay and in Japan is known from only two localities in north 

 Hondo. In Korea the southern limit of its range appears to be the Chiri-san range, 

 and Herschel Island in about the same latitude. Curiously it does not grow on 

 Quelpaert Island where the representative species is R. Weyrichii Maxim. On the 

 lower-middle slopes of Chiri-san and the lower slopes of the Diamond Mountains 

 R. Schlippenbachii is extraordinarily abundant. In June these regions are a 

 wonderful sight with literally miles and miles of the purest pink from the millions 

 of flowers of this Azalea. The plant grows from 1 to 5 m. tall and in open places 

 is sturdy and densely branched but in shade the branching is lax. The branches 

 are rigid, erect, verticillate or irregular, covered with curled glandular hairs when 

 young; pale brown the first year, becoming gray and glabrous the second. The 

 leaves are deciduous, thin, clustered in whorls of five at the end of the branches; 

 on strong shoots the whorl may be subtended by a pair of leaves and these by odd, 

 scattered leaves of small size; in shape they are all uniform being more or less 

 obovate (often broadly so), from 5 to 9 cm. long and from 3 to 7 cm. wide, the 

 apex is truncate or rounded, emarginate, with a glandular mucro, and the base is 

 narrowed to a short, broad petiole; the margins are slightly undulate, and both 

 surfaces are at first sparsely pubescent but later are glabrous except on the under- 

 side of the principal nerves. The leaves are dark green above, pale below and 

 in autumn change to yellow, orange and crimson. The flowers are fragrant, borne 

 in terminal 3- to 6-flowered umbellate clusters, and usually open as the leaves be- 

 gin to unfold. The corolla is pale- to rose-pink, broad-rotate, funnel-shape, from 

 6 to 8 cm. in diameter, with spreading, rounded lobes, the posterior marked with 

 red-brown spots. The pedicels and calyx are clothed with glandular hairs, and 

 the calyx-lobes are green, ovoid, about 5 mm. long and persistent. The stamens, 

 always 10 in number, are of unequal length, the longest equalling the corolla 

 but shorter than the style. The fruit is erect, oblong-ovoid, about 1.5 cm. long, 

 slightly oblique and covered with sessile glands; the seeds are angular, shining dark 

 brown. 



