180 JOURNAL OF THE ARNOLD ARBORETUM [vol. v 



Style glabrous; corolla red, rarely white or pink. 

 Flowers more than 2.5 across. 



Leaves elliptic to elliptic-oblong or oblong-obovate, from 2 to 5 



cm. long 30. R. Sirnsii 



Leaves oval to ovate-lanceolate, 1 to 2 cm. long. 31. R, longiperulatum 

 Flowers less than 2.5 cm. across; leaves oblanceolate to oval, 1 cm. 



or less long 32. R. Nakaharai 



Corolla with short or long cylindric tube and spreading lobes; stamens 5. 



Style villose at base; corolla white to rose-color 33. R. Seniavinii 



Style glabrous; corolla lilac-colored, with a long tube 34. R. Mariae 



Bud-scales viscid on inner surface; corolla wide-funnelform. 



Corolla white; shoots and petioles clad with pilose non-glandular hairs 



35. R. boninense 



Corolla red. 



Shoots and petioles clad with pilose often gland-tipped hairs; leaves not 



conspicuously dimorphic, entire 36. R. Oldhamii 



Shoots and petioles not pilose nor glandular; leaves conspicuously dimorphic, 



subcrenulate 37. R. scahrum 



24. Rhododendron breviperulatum Hayata, Icon. PI. Formos. ill, 

 129 (1913).— Kanehira, Formos. Trees, 318, 319, fig. 16 (1917).— 



Komatsu in Tokyo Bot. Mag. xxxn. (14) (1918). 



A much-branched shrub, branches slender rigid, clothed with flattened 

 shining brown appressed strigose hairs. Leaves chartaceous, clothed 

 with scattered appressed-pilose hairs shining brown changing to gray, 

 scattered and clustered, ovate-elliptic to oblong-obovate, 2-3 cm. long, 

 1-1.5 cm. wide, obtuse, callose-mucronulate, base narrowed, dark green 

 above, paler below, costa impressed on upper surface, venation reticulate; 

 petiole 0.3-0.5 cm. long. Flowers 3 to several in terminal fascicles, 

 pedicels 0.4-0.6 cm. long, with calyx and ovary clothed with shining 

 brown flattened pilose hairs; calyx minute, 5-lobed, lobes membranous 

 ovate, 1-1.5 mm. long, ciliate; corolla funnelform, about 1.5 cm. long, 

 5-lobed; stamens 5, shorter than corolla, filaments flattened, glabrous 

 or virtually so, anthers oblong, 1.5 mm. long, apiculate at base; pistil 



over-topping stamens, ovary conic, densely pilose, style glabrous except 



at extreme base, filiform, dilated below capitate stigma. Fruit not seen. 

 Habitat: Formosa, mountains of Nanto and Giran prefectures. 



This Azalea is distinguished from other Formosan species by its small 

 flowers, each with 5 stamens, with glabrous, or virtually so, filaments and 

 anthers distinctly apiculate at the base. It is most closely related to 

 R. rubroyilosum Hayata which has rather larger flowers each with 7 or 8 

 stamens with villose filaments, non-apiculate anthers and a markedly 

 pilose style, the leaves, moreover, are thicker and the costa more densely 

 clad with hairs in R. rubropilosum Hayata. When working on my Mono- 

 graph of Azaleas I had only the original description to guide me and 

 confused R. breviperulatum Hayata with a much larger flowered plant 

 which I now consider a new and distinct species and have named R. 

 Sasakii. Hayata gives Mt. Pusasai in Nanto prefecture as the type 

 locality. Material kindly supplied by R. Kanehira from the Govern nient 

 herbarium of Formosa and marked "co-type" is localized as Mt. Egiri, 



