218 JOURNAL OF THE ARNOLD ARBORETUM [vol. v 



Kansu: Min chow, W. Purdom, no. 1028, 1910. — See also Maximowicz, 

 1. c.i and Hemsley, 1. c. 



Distribution (including varieties): also Yunnan; Himalayas, Man- 

 churia, Korea, Japan. 



In typical P. tomentosa the branchlets at least when young and the under 

 side of the leaves are densely pubescent, but in Hers no. 425 from Yung 

 ning and no. 1269 from Sung hsien, Honan, the branchlets are quite glab- 

 rous and the leaves are only slightly and sparingly villose on the midrib 

 and the veins beneath, but in all other characters the specimens agree 

 perfectly with P. tomentosa of which it apparently represents a glabrescent 

 form. These specimens were originally identified as P. triloba and on the 

 strength of it the species was credited to Honan in Hers' List of Honan 

 ligneous plants. Also Hers' no. 318 from Yu tai shan, which is in flower, 

 seems to belong to this glabrescent form. The species is cultivated for 

 its fruit near Peking (see Bretschneider, 1. c, and Darrow, 1. c). 



Prunus tomentosa var. endotricha Koehne in Sargent, PI. Wilson, i. 

 225 (1912). 



Shensi: several localities, G. Giraldi (ex Koehne, 1. c). 

 Distribution: also Hupeh, Szechuan. 



Prunus tomentosa var. breviflora Koehne in Sargent, PI. Wilson, i. 

 270 (1912). 



Shensi: Quan tou shan, G. Giraldi, no. 5295, May 5, 1898 (ex Koehne). 



Prunus tomentosa var. trichocarpa Koehne in Sargent, PI. Wilson, i. 



270 (1912). 



Prunus trichocarpa Bunge in M6m. Div. Sav. Acad. Sci. St. P6tersb. n. 96 

 (Enum. PL Chin. Bor. 22) (1833). — Maximowicz in M6m. Div. Sav. Acad. 

 Sci. St. P£tersb. ix. 471 (Ind. Fl. Pekin.) (1859).— Bretschneider, Hist. 

 Eur. Bot. Discov. China, 332 (1898). 



Chili: A. Bunge (ex Koehne, 1. c). 



Prunus tomentosa var. tsuluensis Koehne in Sargent, PI. Wilson. I. 



270 (1912). 



Shensi: Tsu lu, G. Giraldi, no. 5295, May 4, 1897 (ex Koehne). 



Koehne cites under this variety and under var. breviflora the same 

 number which is apparently a mistake; localities and dates are different. 



Prunus dictyoneura Diels in Bot. Jahrb. xxxvi. beibl. lxxxii. 57 

 (1905).— Koehne in Sargent, PL Wilson. I. 262 (1912). 



Prunus humilis £. villosula Bunge in M6m. Div. Sav. Acad. Sci. St. Petersb. 

 ii. 97 (Enum. PI. Chin. Bor. 23) (1833). 



Chili: Peking, 0. Warburg, no. 6607 (flowers); Ssi-jui-ssy (ex Bunge, 



1. c). 



Honan: Teng feng, Yu tai shan, J. Hers, no. 307, June 17, 1919; Sia 

 shi, J. Hers, no. 346, May 25, 1921; Mung ning, Tsi li ping, J. Hers, no. 

 476, May 22, 1919; Yu tai shan, J. Hers, no. 320, April 20, 1920 (flowers). 



Shansi: Yuan kiu hsien, Ni shan, J. Hers, no. 1818, September, 28, 1921. 



