1925] WILSON, THE RHODODENDRONS OF EASTERN CHINA 185 



funnelform-campanulate, 4-5 cm. long and broad, 5-lobed, lobes ascend- 

 ing-spreading, spathulate to obovate, rounded or obtuse; stamens 10 ; 

 shorter than corolla, filaments papillose in lower half, anthers pale, 

 sub-globose; pistil nearly as long as corolla, over-topping stamens, ovary 

 ovoid, style filiform, pilose in lower half, stigma capitate. Fruit oblong- 

 ovoid, 1.5-1.8 cm. long, densely clothed with gray brown, pilose hairs; 

 pedicel stout 1—1.5 cm. long, pilose. 



Habitat: Bonin Islands. 



This is a well-marked endemic species characterized by its large white 

 flowers, by the long shaggy rufous-gray hairs on shoot and petioles and 

 by its crowded, scattered homomorphic leaves. It is related to R. 

 mucronatum G. Don which is distinguished by its glandular-pubescent 

 calyx and gland-tipped hairs scattered on both surfaces of the leaf. The 

 Bonin Azalea is evidently a very beautiful plant. It is known only from 

 one mountain on the island of Chichishima, the largest of the Bonin 

 group, where it was discovered in 1920 by Messrs. T. Nakai and H. 

 Toyoshima. The habitat is said to be difficult of access and only one 

 group of plants were found. Through Dr. Nakai's assistance Mr. H. 

 Toyoshima sent seed to the Arnold Arboretum in the autumn of 1924 

 and these have been distributed among friends in America and England. 



31. Rhododendron Oldhamii Maximowicz in Mem. Acad. Sci. St. 

 Petersb. ser. 7, xvi. no. 9, 34 (Rhodod. As. Or.) (1870).— Wilson in Wilson 

 & Rehder, Monog. Azal. 67 (1921), where complete references and 

 synonymy and a full account of the species are given. 



37. Rhododendron scabrum G. Don. Gen. Syst. in. 846 (1834). 

 Wilson in Wilson & Rehder, Monog. Azal. 59 (1921), where complete 

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



Sect. II. SCIADORHODION Rehd. & Wils. 



KEY TO THE SPECIES 



Leaves ovate; corolla pale lilac-purple; stamens 8 to 10; fruit conic-ovoid on a 

 curved pedicel 38. R. Farrerae 



Leaves ovate to ovate-lanceolate; corolla rose-color; stamens 10; fruit short- 

 cylindric, erect 39 R. Maricsii 



38. Rhododendron Farrerae Tate apud Sweet, Brit. Flow. Gard. ser. 

 2, I. t. 95 (1831).— Wilson in Wilson & Rehder, Monog. Azal. 79 (1921), 

 where complete references and synonymy and a full account of the species 

 are given. 



39. Rhododendron Mariesii Hemsley & Wilson in Kew Bull. Misc. 



Inform. 1907, 244.— Wilson in Wilson & Rehder, Monog. Azal. 80 (1921), 



where complete references and synonymy and a full account of the species 

 are given. 



