244 



THE 



[vol. IV 



Mutsu 



1000-1 



>00 m., E. H. Wilson, No. 7118, July 6, 1914. Hokkaido: prov. 

 Oshima, Hakodate, C. Maximowicz, 1861 (Herb. Gray); prov. Shiribeshi, Shiri- 

 beshi-san, alt. 1000 m., E. H. Wilson, No. 7298, July 27, 1914; prov. Ishikari, 

 Moiwa-dake, ex Herb. Sapporo Agric. College, July 29, 1891; same locality, 

 C. S. Sargent, September 17, 1892; same locality, S. Arimoto, September 24, 1903, 

 (Herb. Gray); Yubari, E. Tokubuchi, August 11, 1893 (Herb. Gray). 



Korea: Quelpaert Island, E. H. Wilson, No. 9402, November 2, 1917; same 

 locality, June 25, 1908, E, Taquet, Nos. 811, 2886, 2887, June, 1909, July, 1909. 



Cultivated: Arnold Arboretum, July 9, 1904 (No. 4710); Japan, Hokkaido, 

 Botanic Garden, Sapporo, C. S. Sargent, September 16, 1892. 



This form may be distinguished by its larger caudate-acuminate leaves 



9 to 18 cm. long and 5-12 cm. wide, though it is scarcely worth a distinctive 



name. It has a similar distribution to the type but is more common 



in the northern part of Hondo and in Hokkaido. The sterile ray-flowers 



are usually blue but not invariably so on the wild plants. In books A. Gray 



is cited as the first to unite Siebold's H. acuminata with H. Hortensia DC. 



and there is no doubt Gray intended to do this but the specimens he so 



named in the Gray Herbarium belong to a different species recently named 



//. Kawagoeana Koidzumi (in Tokyo Bot. Mag. xxxn. 138 [1918]). 



The material in the Gray Herb, consists of one sheet of four fragments 



each in flower and bears two labels. One label says, "Loo-choo Islands, 



Cleopatra Island, T. Small"; the other "Simoda, Japan, C. Wright col]." 



The material is obviously all from the same plant and I am sure came from 



Cleopatra Island and not from Simoda. The firm purple-brown bark at 



once distinguishes this plant from either Siebold's or De Candolle's species. 



Another form is: 



Hydrangea serrata f. pubescens Wilson, n. comb. 



Hydrangea Hortensis /3. pubescens Franchet & Savatier, Enum. PL Jap. I. 



151 (1875), not H. pubescens Decaisne. 

 Hydrangea opuloides i. sinensis Dippel, Handb. Laubholzk. in. 324, fig. 172 



as H. sinensis (1893). 



Hydrangea opuloides d. pubescens Schneider, 111. Handb. Laubholzk. I. 392 



(1905).— Matsumura, Ind. PL Jap. n. pt. 2, 180 (1912). 

 Hydrangea sinensis Hort. Simon Louis. 



Japan. Hokkaido: prov. Oshima, Hakkodate, Dr. M. Albrecht, (Herb. 

 Gray). 



Korea: Quelpaert Island, October, 1906, U. Faurie, No. 357: same locality, 

 E. Taquet, No. 810, July, 1908. 



Cultivated: Arnold Arboretum, No. 2443-2; Hort. Simon Louis, 1888, Herb. 



This pubescent form with ovate to ovate-elliptic, caudate-acuminate 

 leaves is fairly distinct though very close to the form acuminata. The sterile 

 ray-flowers are pink and white and the fertile flowers blue. The principal 

 veins on the underside are bearded with soft appressed and spreading hairs; 

 tb-°i base of the leaf is rounded and abruptly cuneate or narrow and 

 cuneate. The Japanese name of this form is Iwa-gaku. 



