ENTJMEEATION OF THE SPECIES 43 



A form with purple flowers and from 5 to 10 stamens is: — 

 Rhododendron obtusum var. Kaempferi f. mikawanum Wilson, 

 n. comb. 



Rhododendron indicum var. mikawanum Makino in Tokyo Bot. Mag. XXIII. 



251 (1909). 

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



(1917). — Komatsu in Tokyo Bot. Mag. XXXII. [37] (1918). 

 Rhododendron purpureum Komatsu in Tokyo Bot. Mag. XXXII. [16] (1918). 

 Rhododendron poukhanense Komatsu I. c. [12] (1918), as to the Japanese plant, 



not Leveill6. 

 Rhododendron poukhanense i. obtusifolium Komatsu I. c. [37] (1918). 

 Rhododendron poukhanense f. acutifolium Komatsu I. c. [38] (1918). 

 Rhododendron scabrum Nakai in Tokyo Bot. Mag. XXXIII. 207 (1919), not 



G. Don. 

 Rhododendron scabrum var. Kaempferi, f. 1. purpureum Nakai I. c. 208. 



Japan : Hondo, prov. Suruga, near Ashitake-yama, lower slopes of 

 Mt. Fuji, June 20, 1918, H. Suzuki; prov. Musashi, Ome, near Tokyo, 

 May 31, 1918, E. H. Wilson. 



This is a form of the common Mountain Azalea of Japan having purple flowers 

 and from 5 to 10 stamens. It is found here and there mixed with the type and is 

 occasionally cultivated, being known as the " Murasaki Yama-tsutsuji " (Purple 

 Hill Azalea). It is in cultivation in the Arnold Arboretum from plants I brought 

 from Japan in the spring of 1919. The increase in the number of stamens is in- 

 teresting, and is another instance of the extraordinary range of variation which 

 obtains in R. obtusum. In Tokyo I saw specimens from Hangno which Komatsu 

 refers to R. poukhanense, but it is not that species and I could find no character by 

 which to separate them from Makino's variety. The material was collected on the 

 Chichibu Mountains in the western part of Musashi province. It has flowers in 

 pairs, red-purple in color, with dark purple anthers; the leaves are rather long, 

 lanceolate and glabrescent, and the pedicels and calyx are clothed with gray pubes- 

 cence. Komatsu's R. purpureum is based on a specimen collected in Yumato prov- 

 ince. It has the foliage of typical var. Kaempferi, pale rose-purple colored flowers 

 each with from 7 to 10 stamens; the calyx-lobes are lanceolate, acuminate and erose. 



Nakai in the Tokyo Bot. Mag. (XXXIII. 207 [1919]) identified this plant with 

 R. scabrum G. Don. I do not understand how he arrived at this conclusion unless 

 he was guided solely by the color of the flowers. This f. mikawanum never has 

 flowers 3 inches in diameter, which is the size given by G. Don, neither are the 

 leaves coriaceous. It seems to me that the plant described by G. Don as R. scabrum 

 is that which Miquel later described as R. sublanceolatum; from the description I 

 do not see how it can have anything to do with R. obtusum var. Kaempferi or any 

 of its forms. 



A hybrid race with richly colored flowers of small to medium 



size is: — 



X Rhododendron Sanderi Wilson, n. hyb. 



Rhododendron Simsii " Garnet " x R. obtusum Planchon. 



This is an interesting and valuable race that has been raised and developed at 

 Holm Lea, Brookline, the home of Professor C. S. Sargent. About thirty-five years 



