176 JOURNAL OF THE ARNOLD ARBORETIM [vol. vi 



broad, deeply 5-lobed; tube narrow, lobes spreading, spathulate to obo- 

 vate, obtuse or rounded and emarginate; stamens 10, shorter than corolla 

 filaments papillose-pubescent in lower half, anthers oval; pistil over- 

 topping stamens, shorter than corolla, glabrous, ovary cylindric, 0.8 

 cm. long, furrowed, glabrous, style filiform, thickened below the capitate 

 stigma. Fruit dark brown, cylindric, 2-3.5 cm. long, furrowed, often 

 crowned with remains of style; seeds shining brown, oblong, 1.5-2 mm. 



long, wingless, with slight prolongation of testa at apex and base. 



Habitat: Formosa, Kagi province, Arisan, from 1650 to 2650 m. altitude. 



From R. leiopodum Hayata, the other Formosan species of its group, 

 this is distinguished by its pubescent winter-buds and by its pectinate- 

 ciliate calyx. It is very local in distribution and so far known only from 

 the Arisan region in central Formosa. I saw several large bushes and 



gathered specimens bearing old fruits but none in blossom. My descrip- 

 tion of the flowers is drawn from a co-type specimen. In my opinion its 

 position as a species rests more on its pubescent winter-buds than on the 



characters set forth by Hayata. 



On cliffs and among rocks I would call it fairly common in the forested 

 gions on and around Arisan. It is a large bush, open in habit, with 



polished green leaves, crowded at the ends of the branches. It was 



discovered by Messrs. Hayata, Kanehira and Tanaka in April, 1914, 



but has not yet been introduced into cultivation. 



20. Rhododendron Wilsonae Hemsley & Wilson in Kew Bull. Misc. 

 Inform. 1910, 116.— Wilson in Jour. Arnold Arb. v. 106 (1924), where 

 a full account of the species is found. 



This rare species, first discovered in Hupeh, so far as is known, has 

 the eastern limits of its distribution on the mountains of northern 

 Kwangtung where it was discovered in 1917 by Rudolf Mell. 



21. Rhododendron leiopodum Hayata, Icon. PI. Fornios. in. 136, t. 

 24 (1913).— Kanehira, Formos. Trees, 319, fig. 6, 322 (1917). 



Rhododendron ellipticum Maximowiez in Bull. Acad. Sci. St. P6tersb. s&\ 3, 

 xwii. 497 (in Mel. Biol. xn. 742) (1888), in part, as to the Yaey a ma plant. — 

 Tashiro in Tokyo Hot. Mag. in. 201 (1889).— Matsumura in Tokyo Bot. 

 Mag. xn. 13 (1898); End. PI. Jap. n. pt. 2, 459 (1912).— Makino in Tokyo 

 Bot. Mag. xviii. 47 (1904); Icon. Fl. Jap. i. pt. 3, 15, t. 9 (1906).— Hayata 

 in Jour. Coll. Sci. Tokyo, xxv. art. 19, 152 (Fl. Mont. Formos.) (1908).— 

 Not Maximowiez, as to the type. 



Rhododendron leptosanthum Hayata, Icon. PI. Formos. in. 137 (1913). — 

 Kanehira, Formos. Trees, 319, fig. 2, 323 (1917). 



Rhododendron leptanthum Komatsu in Matsumura, Icon. PI. Koisikav. n. 



93, t. 131 (1915).— Not F. Mueller. 

 Bush c 2-6 m. tall, with slender rigid verticillate glabrous branches; 



winter-buds clustered, acute, glabrous, bud-scales ciliolate. Leaves 



glabrous, clustered at end of shoot, subverticillate, sub-coriaceous, 



oblanceolate-oblong to oblong-lanceolate, 6-12 cm. long, 2 4.5 em. wide, 



acute or short-acuminate, mucronulate, base narrowed, cuneate, upper 



surface lustrous dark green, lower pale green to pallid, secondary veins 



