1923] WILSON, THE RHODODENDRONS OF NORTHEASTERN ASIA 53 



on the free shoots, crowded on others, petiolate, subcoriaceous, oval to 

 lanceolate-ovate, 1-5 cm. long, 0.5-2.5 cm. wide, rounded or obtuse, 

 sometimes truncate and slightly emarginate, apiculate at apex, rounded or 

 narrowed at base, crenate-serrate, often ciliolate, dark green above, pale 

 below, pubescent on the midrib on both surfaces; petiole slender, 4-12 mm. 

 long, pubescent, often bearded with long, gland-tipped hairs. Flowers 

 opening after the leafy-shoots have developed, solitary from axillary clus- 

 tered buds, subtended by persistent paleaceous bud-scales, white spotted 

 with red, about 2 cm. across; pedicels glandular; calyx a disc with 5 min- 

 ute teeth, densely glandular and ciliolate; corolla sub-rotate, with 5 more 

 or less oval lobes spreading from a short tube; stamens 5, exserted, un- 

 equal, 3 long, 2 short, divergent, filaments densely villose in basal half; 

 pistil shorter than stamens, ovary densely stipitately glandular, style gla- 

 brous, persistent, stigma capitate. Fruit subglobose, about 4 mm. long, 

 shining, brownish black, densely stipitately glandular; seeds wingless, 

 obovoid, very dark brown. 



Habitat. Japan, mountains of Kyushu, Shikoku and Hondo from Mt. 

 Kirishima northward to Mt. Iwate. 



This is an odd-looking, very glandular plant with small, concealed 

 flowers produced singly from a lateral bud. At the end of the shoot a 

 cluster of buds are formed, the central one develops into a leafy shoot 

 and the lateral ones, of which there may be 5 or 6, each produces a solitary 

 flower; the whole forms a false cluster, the flower-stalks are hidden among 

 the chaffy bud-scales. The flowers are small and hidden beneath the 

 leaves. The fruit is very sticky and being small gathering seed is a tedious 

 business. The autumn tints of the leaves range from yellow and orange 

 to crimson. This species is wide-spread in Japan where I have gathered it 

 from Kirishima in the south to Matsushima in northern Hondo. In the 

 woods bordering the Otake-gawa in Shinano province it is abundant. It 

 forms a rather narrow bush and may be from one to six feet high. It was 

 discovered by Maximowicz's collector, Tschonoski, who sent seeds to the 

 Botanic Garden, Petrograd, where it flowered in 1870 in a greenhouse and 

 was figured by Regel in the Gartenflora. In 1914, I collected seed and 

 plants were raised and distributed by the Arnold Arboretum. This species 

 can only recommend itself to the collector for its flowers have little in the 

 way of beauty. In the Arnold Arboretum it has not proved hardy though 

 I think it should be. 



Subgen. III. THERORHODION Rehd. 



Rhododendron subgen. Therorhodion Rehder in Wilson & Rehder, 

 Monog. Azal. 109, in text (1921), as a subgenus. 



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



P6tersb. ser. 7, xvi. 15 (Rhod. As. Or.) (1870). 

 Therorhodion Small in North Am. Fl. xxix. pt. 1, 45 (1914), as a genus. 



