26 WILSON EXPEDITION TO CHINA 



Kiangsi: Killing, abundant, side of streams, July 27, 1907 (No. 

 1601). 



This is as far as I know the first time that H. paniculata has been found in China. 

 The specimen differs very little from the Japanese plant; the serratures of the 

 leaves are strongly incurved, the veins are yellow on the upper side and strigosely 

 pubescent below, while in the Japanese specimens the leaves are nearly glabrous 

 and the teeth are slightly spreading. 



Hydrangea hypoglauca Rebder, n. sp. 



Frutex ad 3 m. altus ramulis junioribus castaneo-purpureis glabris, 

 lenticellis inconspicuis institutis. Folia ovata v. ovato-oblonga, 

 acuminata, basi rotundata v. late cuneata, argute mucronulato- 

 serrulata, supra flavo-viridia, glabra nervis strigosis flavescentibus 

 exceptis, subtus glauca (sub lente dense papillosa), ad nervos dense 

 pubescentia ceterum glabra, 7-10 cm. longa et 2.5-4.5 cm. lata; peti- 

 oli graciles, parce pilosi, 2-3 cm. longi. Cyma laxa, convexa, radii s 

 5-7 decussatis distantibus composita, strigosa; flores radiantes 2-3 

 cm. diam., sepalis 3-4 late ovalibus v. obovatis albis; calycis dentes 

 florum fertilium ovato-triangulares, acuminata; petala alba, ovato- 

 oblonga, concava, apice cucullata, 2 mm. longa; stamina inaequalia, 

 breviora petalis subaequilongis, longiora 3 mm. longa; styli 3, erecti; 

 ovarium semisuperum. Capsulae maturae desiderantur. 



Western Hupeh: A. Henry (No. 6056, type); north and south of 

 Ichang, thickets, alt. 900-1800 m., June 1907 (No. 2397); no locality, 

 June 1901 (Veitch Exped. No. 1271). 



Allied to Hydrangea xanthoneura Diels which differs chiefly in the more or less 

 elliptic leaves being green on the under side with strigose veins and in the trian- 

 gular obtusish sepals. 



Hydrangea xanthoneura Diels in Bot. Jahrb. XXIX. 373 (1900). 



Szech'uan: Nanch'uan, Ching-lung-tsui, August 9, 1891, A. von 

 Rosthorn (No. 354, type); Wa-shan, thickets, alt. 1800-2600 m., July 

 and November 1908 (Nos. 2409, flowers, and 1354, fruits) ; Tachien-lu, 

 thickets, alt. 2400-2700 m., October 1910 (No. 4391); Pan-lan-shan, 

 west of Kuan Hsien, thickets, alt. 2200 m., August 1910 (No. 4484). 

 Mt. Omei, July 1904 (Veitch Exped. Nos. 4899 and 4900). 



This is apparently a very variable species and closely related to H. Bretschneideri 

 from which it can be separated only by the glabrous or glabrescent under side of 

 the leaves more or less cuneate at the base. In the type the under side of the leaves 

 is glabrous or nearly glabrous except the strigose veins which are yellowish on the 

 upper side; the branchlets are bright reddish brown with the bark without lenticels 

 and soon separating into thin flakes. Wilson's Nos. 4391 and 4899 seem nearest 

 to the type. No. 4484 is also near the type, except that it has the leaves loosely 

 pubescent beneath, while the other numbers of Wilson differ in their large foliage, 



