36 JOURNAL OF THE ARNOLD ARBORETUM [vol. iv. 



rose-pink, in loose umbellate corymbs, campanulate, 4.5-6.5 cm. across; 

 pedicels slender, 2-4 cm. long, clothed with gray to ferrugineous curled 

 hairs; calyx a mere rim with 5 or 7 minute teeth, pubescent; corolla 5- or 

 7-lobed, lobes rounded, spreading; stamens 10-14, shorter than corolla, 

 filaments puberulous to pubescent in lower half; pistil exceeding stamens, 

 ovary ovoid, densely tomentose with curled red-brown hairs, style gla- 

 brous, stigma slightly capitate. Fruit oblong, 1-2 cm. long, furrowed, 

 valves thin, glabrescent; seed brown, oblong, slightly winged. 



Habitat. Japan, from Kyushu north through Shikoku and Hondo to Adzuma- 

 san in Uzen province. 



This is the common evergreen Rhododendron of Japan and is not known 

 to grow wild outside of that country. It is unknown in Hokkaido and does 

 not occur in extreme northern Hondo. From Adzuma-san on the borders 

 of Uzen and Iwashiro provinces southward it is a common plant being found 

 at lower levels than its relative R. brachycarpum D. Don. Through the 

 Nikko region, on Mt. Fuji and on the mountains of Shinano province it is 

 particularly abundant between 3000 and 7000 ft. above sea-level. It 

 grows with miscellaneous forest plants and from the middle of May to end 

 of June, according to latitude, is one of the floral features of the forests. 

 It exhibits quite a range of variation in size of leaf and color of flowers. 

 In the form on which Siebold and Zuccarini based the species the flow 

 are 7-partite. Matsumura gives the mountains of Kyushu and of Shi- 

 koku as the habitat of this plant. I did not see this form in Japan and it is 

 known to me only from a specimen collected round Takeo in Kyushu by 

 Pere U. Faurie. This has flowers 2j^ inches across and the indumentum 

 is rust-colored. This Rhododendron is mentioned by Kaempfer (Amoen. 

 Exot. fasc. v. 877 [1712]) under the vernacular name of "Seki Nan, vulgo 

 Saku Nange," and he states that there are two forms one with white and 

 another with smaller reddish flowers. Kaempfer must have seen it in 

 Japanese gardens for it is unlikely that he or any of the writers before 

 Maximowicz saw this plant in a wild state. So far as I can discover this 

 7-merous form has not been introduced into cultivation in Europe or 

 America. Judging by the solitary example before me it appears to be a 

 finer plant than the variety we have in our gardens. 



Rhododendron Metternichii var. pentamerum Maximowicz in M£m. 

 Acad. Sci. St. lYlersb. ser. 7, xvi. no. 9, 22 (Rhod. As. Or.) (1870). — Bean, 



Trees & Shrubs, Brit. Isl. n. I5()7 (1914). 



Rhododendron Hymenanthes /3. pentamerum Makino in Tokyo Bot. Mag. 



xvi. 33 (1902).— Matsumura, Ind. PI. Jap. n. pt. 2, 460 (1912). 

 Rhododendron japonicum var. pentamerum Hutchinson in Bot. Mag. cxxxvu. 



t. 8403 (1911). 

 Rhododendron Nakaii Komatsu in Matsumura, PI. Koisikav. i. 145, t. 73 



(1913). 



This form, which is really typical of the species, is distinguished by its 

 5-merous flowers which naturally are smaller than those of the 7-merous 



