32 WILSON EXPEDITION TO CHINA 



Exped. No. 1473); South Wushan, 1901 (Veitch Exped. No. 2446); 

 without locaUty, 1901 (Veitch Exped. No. 2527); A. Henry (No. 

 1083). Western Szech'uan: Mt. Omei, 1904 (Veitch Exped. No. 

 4902 with all the flowers sterile); Nanch'uan, Shan-tzu-p'ing, A. von 

 Rosthorn (No. 299). 



Closely related to H. aspera D. Don which chiefly differs in the fimbriate-denticu- 

 late leaves being on the under side on the veins and veinlets covered with a villose- 

 hirtellous, not appressed strigose pubescence and in the larger capsules with 

 usually three styles. The difference in pubescence and serration, serrulate, with the 

 teeth pointing forward in //. strigosa, and denticulate or dentate with spreading 

 teeth in H. aspera, seems to distinguish clearly the Chinese from the Himalayan 

 plant of which I have seen Wallich's No. 440 B; the pubescence of that specimen 

 agrees well with Don's original description "foHis . . . subtus dense cano-tomen- 

 tosis " and Clarke's description "under surface with gray woolly hairs," terms 

 which hardly could be applied to the strigose pubescence of the Chinese plant. In 

 size and shape of foliage the Chinese plant seems exceedingly variable, and the fol- 

 lowing forms pass gradually into each other. 



Hydrangea strigosa, var. macrophylla Rehder, n. comb. 



H. aspera, var. macrophylla Hemsley in Jour. Linn. Soc. XXIII. 273 (1887). — 

 Diels in Bot. Jahrb. XXIX. 375 (1900). 



Western Hupen: A. Henry (Nos. 2083, 6477); Fang Hsien, thick- 

 ets, alt. 1300 m., Au'»ist 1907 (No. 571); Hsing-shan Hsien, thicket, 

 alt. 900-1200 m., August and December 1907 (No. 757). Western 

 Szech'uan: Mt. Omei, July 1904 (Veitch Exped. No. 4902); Nan- 

 cl " lan, Chang-kou, September 18, 1891, A. von Rosthorn (No. 953). 



The leaves of this form are sometimes 28 cm. in length and 11 cm. in width and are 

 generally ovate-lanceolate or sometimes ovate-oblong and nearly rounded at the 

 base. This form passes gradually into the type, and some specimens enumerated 

 under the type, as Wilson's Nos. 2394 and also No. 773 and Henry's No. 1083, 

 with leaves 22 cm. long and 6.5 cm. broad, might perhaps be referred to var. 

 macrophylla, but the leaves are comparatively narrow and cuneate at the base. 



Hydrangea strigosa, var. sinica Rehder, n. comb. 

 H. aspera, var. f sinica Diels in Bot. Jahrb. XXIX. 375 (1900). 



Western Hupeh: A. Henry (No. 185); Nan-t'o, A. Henry (No. 

 2206). Western Szech'uan: Nanch'uan, Ma-fou-hn-p'o, August 26, 

 1901, A. von Rosthorn (No. 629). 



Differs in its oblanceolate or oblong-obovate leaves rarely exceeding 10 cm. 

 in length, the leaves having generally their greatest width above the middle, not 

 below as in the other forms. 



Hydrangea strigosa, var. angustifolia Rehder, n. comb. 

 H. aspera var. i angustifolia Diels 1. c. 



