164 JOURNAL OF THE ARNOLD ARBORETUM [vol. vi 



umbellate; pedicels slender, 1.5-2 cm. long, glabrous; calyx glabrous, 



saucer-shaped, with 5 minute triangular acute or obtuse teeth; corolla 



campanulate, about 3 cm. long and broad, 5-lobed, lobes spreading, 



rounded, emarginate; stamens 10, unequal, rather shorter than corolla, 



filaments flattened and villose at base; pistil slightly exceeding stamens, 



ovary oblong-ovoid, 0.4-0.5 cm. long, furrowed, glabrous, style filiform, 



glabrous; stigma capitate, lobed. Fruit unknown. 

 Habitat: Formosa, Nankotaisan, alt. 3300 m. 



This species is characterized by its glabrous, oblong-lanceolate leaves, 

 its relatively small campanulate flowers with glabrous pedicels and 

 pistil. It is a critical species closely related to R. Morii Hayata and may 

 indeed be a glabrous condition of that species which is larger in all its 

 parts, with the petiole and often t he under surface of the leaves sometimes 

 floccose-tomentulose, the pedicels short stipitate-glandular and the 

 ovary clothed with short red-brown hispid pubescence. The material 

 available is, however, too fragmentary for accurate comparison. It 



consists of two leaves, two flowers and two separated pistils of tin 4 co- 

 type of R. nankotaisanense Hayata. The author describes the filaments 



as glabrous whereas in the flowers I have they arc densely villose at the 

 base. 



This species was discovered in April 29, 1917, by S. Sasaki on Mt. 

 Nankotaisan and does not appear to have been re-collected or found 

 elsewhere. It is not in cultivation. 



5. Rhododendron Morii Hayata in Jour. Coll. Sci. Tokyo, xxx. art. 



1, 17:5 (Mat. Fl. Formos.) (1911); Icon. PI. Formos. in. 139 (1913); vi. 



28 (1916).— Kanehira, Formos. Trees, 31!), fig. 1, 324 (1917). 



Rhododendron brachycarpum Hayata in Jour. Coll. Sci. Tokyo, xxv. 1-12 (Fl. 



Mont. Formos.) (1908).— Not (J. Don. 



Rhododendron pachysanthum Hayata, Icon. PL Formos. in. MO (1913). — 



Kanehira, Formos. Trees, 311),' fig. 4, 825 (11)17). 



Bush 2 S m. or tree 10 m. tall with trunk 1 m. in girth, much branched, 

 branches rather slender, with short gray scurfy tomentilm, usually 

 soon glabrous or glabreseent. Leaves subcoriaceous, often crowded, 

 oblong-lanceolate, 6-15 em., usually S 12 em. long, 2 4 em., usually 2.5- 

 3 cm. wide, acute or short-acuminate, apiculate, base abruptly narrowed, 

 rounded, sometimes sub-auriculate, often broad-cuneate, occasionally 

 oblique, when mature green, glabrous and somewhat lustrous on both 

 surfaces, sometimes sparsely floccose-tomentulose on lower surface, 

 midrib impressed above, prominent below, secondary veins obscure on 

 upper, often slightly raised on lower surface; petiole 1-2.5 em. long, 

 channelled above, glabrescent or gray floccose-tomentulose. Flowers 

 (I 20, umbellate-racemose; rhachis 1-3 cm. long; pedicels ascending- 

 spreading or spreading, 1.5 2.5 em. long, short-stipitate-glandular; 



calyx minute, saucer-shaped with 5 small triangular teeth, glabrous or 

 nearly so; corolla white, dotted with brown-purple honey guides, cam- 

 panulate, 3.5 4.5 cm. long and broad, 5-lobed, lobes somewhat spreading, 



