SAXIFRAGACEAE. — HYDRANGEA 27 



the leaves attaining a length of 15-20 cm. with the petioles 4 cm. long and the 

 inflorescence measuring 25 cm. in diameter. 



Hydrangea xanthoneura, var. Wilsonii Rehder, n. var. 



A typo recedit ramulis hornotinis griseo-flavescentibus, annotinis 

 griseis v. avellaneis lenticellis pallidis instructis cortice adhaerente et 

 foliis junioribus subtus sparse adpresse pubescentibus. Arbor ad 5 m. 

 alta. 



Western Szech'uan: Ta-p'ao-shan, northeast of Tachien-lu, 

 woodlands, alt. 2400-2800 m., July 3, 1908 (No. 2407, type); Pan- 

 lan-shan, west of Kuan Hsien, thickets, alt. 2200 m., June 26, 1908 

 (No. 2410); Wa-ssu country, Wen-chuan Hsien, thickets, alt. 1600- 

 2400 m., July 1908 (No. 2408). 



The color and behavior of the bark would seem to afford good specific differ- 

 ences, if it were not for the following specimens which are intermediate in this re- 

 spect between the type and the variety, but are apparently closer to the variety. 



Hydrangea xanthoneura, var. glabrescens Rehder, n. comb. 



Hydrangea serrata Koehne, Deutsch. Dendr. 189 (not De Candolle) (1893). 

 Hydrangea Bretschneideri, var. glabrescens Rehder in Bailey, Cycl. Am. Hort. 

 II. 784 (1900); in Mitt. Deutsch. Dendr. Ges. XII. 121 (1903). 



A typo recedit foliis minoribus, tenuioribus et plerumque angusti- 

 oribus, saepe grossius serratis, venis supra non flavidis, subtus fere 

 glabris v. sparse pubescentibus nee strigosis. 



Seed collected by Dr. E. Bretschneider near Pekin and introduced 

 into cultivation: Hort. Bot. Berol.; E. Koehne, Herb. Dendr. (No. 

 113); Arnold Arboretum, in Herb. Arnold Arboretum. 



It is with some hesitation that I refer this variety to H. xanthoneura, but if the 

 pubescence is to be considered the chief distinguishing character between this 

 species and H. Bretschneideri, it must be referred to the former. 



Western Szech'uan: Mupin, thickets, alt. 1500-2500 m., June and 

 October 1908 (Nos. 1183, 1327); thickets around Tachien-lu, alt. 

 2100-2400 m., October 1908 (No. 1347); near Tachien-lu, 2700-3G00 m., 

 A. E. Pratt (No. 285). Western Hupeh: Hsing-shan Hsien, 

 thickets, alt. 1500-1800 m., July 1907 (No. 2398); no locality, June 

 1901 (Veitch Exped. No. 2184). Yunnan: Mengtze, alt. 2700 m., 

 A. Henry (No. 10235). 



Hydrangea pubinervis Rehder, n. sp. 



Frutex ad 3 m. altus ramulis junioribus glabrescentibus purpureis, 

 vetustioribus castaneis lenticellis sparsis instructis. Folia mem- 

 branacea, alte elliptica, acuminata, basi late cuneata, grossius ser- 



