ENUMERATION OP THE SPECIES 31 



A form with white flowers is: — 



Rhododendron obtusum f . album Schneider, III. Handb. Laubholzk. 

 II. 506 (1911). — Rehder in Bailey, Stand. Cycl. Hort. V. 2944 (1916). 



Azalea ramentaeea Lindley in Jour. Hort. Soc. Lond. IV. 291, fig. (1849). 

 Rhododendron ramentaceum Planchon in Fl. des Serr. IX. 81 (1854); in Rev. 



Hort. 1854, 65. 

 Azalea obtusa alba Mottet, Diet. Hort. Jard. I. 302 (1892-93). 

 Rhododendron (Azalea) Indicum obtusum album, Garden and Forest, IX. 394, 



fig. 52 (1896). — Bean, Trees and Shrubs Brit. Id. II. 362 (1914).— 



Millais, Rhodod. 193 (1917). 

 Azalea indica var. obtusa f. alba Rehder in Bailey, Cycl. Am. Hort. I. 122 



(1900). 

 Azalea amoena alba Moller's Deutsch. G&rtn. Zeit. XVIII. 476, fig. (1903). 



Cultivated: Hort. Holm Lea, Brookline, Mass.; Hort. Berckmans, 

 Augusta, Georgia, March 18, 1909, April 6, 1914, C. S. Sargent. 



This is another of Fortune's introductions from China to the garden of the 

 Horticultural Society of London. It was received in May, 1846, from Hongkong, 

 and certainly from a garden (although this is not expressly stated) and doubt- 

 less of Japanese origin. It has the dense, twiggy habit characteristic of its class, 

 pure white flowers with a normal calyx and rather large leaves. In every essen- 

 tial respect it agrees with f . japonicum Wils., of which it is nothing but a selected, 

 cultivated form, as are A. obtusa, A. amoena, "Hinodegiri" and the "Kurume 

 Azaleas." Among the latter are several white-flowered forms with relatively large 

 leaves. Under f. japonicum the origin of this "obtusum" group of Azaleas is dis- 

 cussed, but I may add here that variants of f . japonicum having white flowers have 

 been found wild on Nishi-Kirishima. Such a plant is growing in a garden at the 

 foot of the mountain and from it I gathered specimens. I have been unable to 

 find out just when this plant was introduced into America but in all probability it 

 was very soon after its appearance in England. For more than sixty years it has 

 been cultivated in the Holm Lea collection and from there was sent by Professor 

 Sargent to England, where it appears that it had become lost, and to the Berck- 

 mans and to other gardens. 



A form with a small corolla and long exserted stamens is: — 

 Rhododendron obtusum f . macrostemon Wilson, n. comb. 



Rhododendron macrostemon Maximowicz in Mim. Acad. Sci. St. PHersbourg, 

 ser. 7, XVI. No. 9, 41, t. 3, figs. 15-20 (Rhodod. As. Or.) (1870).— Franchet 

 & Savatier, Enum. PI. Jap. I. 292 (1875). — Okubo in Tokyo Bot. Mag. 

 IX. 40 (1895). — Schneider, III. Handb. Laubholzk. II. 507, fig. 332 h-k 

 (1911). — Millais, Rhodod. 205 (1917). 



Rhododendron indicum var. macrostemon Okubo & Makino in Tokyo Bot. 

 Mag. XVI. 178 (1902). — Matsumura, Ind. PI. Jap. II. pt. 2, 461 (1912). 



Rhododendron Kaempferi var. macrostemon Makino in Jour. Jap. Bot. I. 18 

 (1917). — Komatsu in Tokyo Bot. Mag. XXXII. [43] (1918). 



Japan: Hondo, prov. Musashi, Tokyo, cultivated, 1862, C. Maxi- 

 mowicz (Herb. Kew, co-type). 



This garden plant is characterised by its small flowers, minute calyx, and long 

 exserted stamens, which are three times as long as the corolla. It is, however, 



