184 JOURNAL OF THE ARNOLD ARBORETIM [vol. vi 



upper surface dark green, lower pale green, both surfaces and petiole 



clothed with shining brown appressed strigose hairs; petiole 1-2 mm. 



long. Flowers 2-3 in terminal fascicles; pedicels erect, .'{.5 nun. long, 



with calyx and ovary densely clothed with shining brown flattened pilose 



hairs; calyx a mere rim with 5 membranous lobes, lobes oval to ovate, 



2 mm. long, ciliate; corolla dark red, funnelform-campanulate, 2 cm. 



long, 5-lobed, tube villose at base within, lobes obovate, rounded; 



stamens 10, about half the length of corolla, filaments villose below 



mid-length, anthers oblong, 2 mm. long, dark colored; pistil slightly 



exceeding stamens in length, ovary conic, about 2 mm. long, densely 



pilose, style glabrous, stigma nearly simple. Fruit not svvn. 

 Habitat: Formosa, Mt. Shiehisei in Taihoku province. 



When working on my Monograph of Azaleas of the Old World I had 

 seen only the type material preserved in the Tokyo Herbarium and 

 accepted Hayata's view of the relationship of this species. I am now in 

 possession of a specimen collected on Mt. Shiehisei by S. Sasaki in May, 

 1924, from which I have drawn a fuller description. I now think this 

 plant is most closely related to R. obtusum Planch, and more especially 

 to the form japonicum Wils. which, however, is easily distinguished by 

 its dimorphic leaves and its flowers with 5 stamens. R. Nakaharai 

 Hayata is a low much-branched twiggy shrub with very small leaves 

 and deep red flowers with 10 stamens. It was discovered on Mt. Shiehisei 

 in July 1!)05 by G. Nakahara; it is not in cultivation. 



83. Rhododendron Seniavinii Maximowicz in Mem. Acad. Sci. St. 



Petersb. scr. 7, XVI. no. 9, 33, t. 8, fig. 21-24 (Rhodod. As. Or.) (1870).— 

 Wilson in Wilson & Rehder, Monog. Azal. 57 (1921), where complete 

 references and synonymy and a full account of the species are given. 



34. Rhododendron Mariae Hance in Jour. Bot. xx. 230 (1882). — 



Wilson in Wilson & Rehder, Monog. Azal. 58 (1921), where complete 

 references and synonymy and a full account of the species are given. 



35. Rhododendron boninense Nakai in Tokyo Bot. Mag. xxxiv. 



(324) (1920), name only; xxxv. 152 (1921). 



A much-branched wide-spreading shrub 2 m. tall branches relatively 

 stout densely clothed with appressed rufous strigose hairs; outer bud- 

 scales clothed with appressed rufous pilose hairs inner villose and glandu- 

 lar on inner surface. Leaves abundant, scattered, homomorphic, 

 chartaceous, oblong-oblanceolate to oblong-lanceolate, 2.5-4.5 cm. long, 

 0.8-1.2 cm. wide, subacute, mucronulate, base narrowed, cuneate, dark 

 green, upper surface sparsely, lower and petiole densely clothed with 

 appressed rufous pilose hairs, costa and secondary veins impressed above; 

 petiole 0.5-1.2 cm. long, channelled above. Flowers fascicled, 4-6, 



subtended by semipersistent bud-scales; pedicels 0.5-1 cm. long with 

 calyx and ovary densely clothed with rufous appressed-strigose hairs; 

 calyx discoid, with 5 minute acute or rounded teeth; corolla white, 



