34 WILSON EXPEDITION TO CHINA 



Hydrangea longipes is closely related to H. Giraldii Diels and also to H. rohusta 

 Hooker f . & Thomson as Franchet has already stated, and some of the specimens, 

 as Wilson's No. 580, which has rather densely pubescent and large leaves, seem 

 somewhat intermediate. Hydrangea longipes Franchet and H. longipes Hemsley are 

 identical; the apparent discrepancies in the descriptions do not exist in reality. 

 First it is to be stated that H. longipes Hemsley does not belong in the section 

 Calyptranthe where Hemsley placed it, apparently misled by the fact that the 

 petals occasionally cohere at the apex, but this may happen in almost all species 

 of the subsection Asperae, which does not differ in the structure of its flowers from 

 Calyptranthe. The description of Franchet contains some misleading inaccuracies; 

 the flowers have 10 stamens and 2 styles, not 5 stamens and 3 styles as Franchet 

 describes them, and the leaves of at least part of the specimens collected by David 

 attain a length of four inches, while Franchet says "folia vix ultra-pollicaria." 

 The only difference I can find between Franchet's and Hemsley's specimens is the 

 somewhat slighter pubescence of the latter, the leaves being sometimes nearly 

 glabrous. A form based on No. 846 of C. Silvestri from the mountains of Chia- 

 yuen-kou, western Hupeh, with the radiant flowers smaller and greenish has been 

 described by Pampanini as H. Hemsleyana, var. Pavoliniana (Nuov. Giorn. Bot. 

 Ital. n. ser. XVII. 284 [1910]). 



Hydrangea anomala D. Don, Prodr. Fl. Nepal. 211 (1825). 



Hydrangea altissima WalHch, Tent. Fl. Nepal, t. 50 (1826). 

 Hydrangea glabra, Hayata in Jour. Coll. Sci. Tokyo, XXV. 89, t. 6 (Fl. Mont. 

 Formos.) (1908). 



Western Hupeh: north and south of Ichang, common, alt. 1200- 

 1800 m., May and October 1907 (No. 491, in part); Packang, July 

 1901 (Veitch Exped. No. 894); A. Henry (No. 6511). Western 

 Szech'uan: Wa-shan, woodlands, alt. 1800-2500 m., June and Octo- 

 ber 1908 (No. 491, in part); Mt. Omei, July 1904 (Veitch Exped. No. 

 4901); Nanch'uan, Yang-yii-ping, A. von Rosthorn (No. 51); South 

 Wushan, A. Henry (Nos. 5557, 5658). Formosa: Mt. Morrison, T. 

 Kawakami & U. Mori (No. 1723 ex Hayata). 



I have been unable to detect in Hayata's description and plate any character 

 by which to distinguish his H. glabra from H. anomala. 



SYNOPSIS OF THE CHINESE SPECIES OF HYDRANGEA. 



As the determination of the copious material collected by Wilson of this genus 

 has necessitated a study of all the Hydrangeas of China and the adjacent parts of 

 Asia, it may be useful to place the results of this study permanently on record in 

 the shape of a synopsis of all the Chinese species of Hydrangea. 



KEY TO THE SPECIES. 



* Semina exalata v. utrinque in alam protracta; petala apice soluta, patentia; 

 frutices erecti raro scandentes ramulis annotinis medulla alba solida ampla. 



Sect. I. EUHYDRANGEA. 

 t Ovarium semisuperum; capsula ovoidea apice in stylos plerumque 3 attenu- 

 ata; stamina petala vix v. paullo superantia, subaequalia. 



