330 WILSON EXPEDITION TO CHINA 



Rosa graciliflora Rehder & Wilson, n. sp. 



Frutex 2-4-metralis, gracilis; rami graciles, annotini fusco-purpurei 

 V. purpurascentes, aculeis gracilibus sparsis saepe infraaxillaribus ad 

 1 cm. longis mimiti, interdum fere inermes. Folia membranacea, 

 9-1 1-, rarius 7-foliolata, 4-10 cm. longa petiolo incluso; foliola breviter 

 petiolulata, ovalia v. elliptica, apice rotundata, lateralia basi rotun- 

 data, raro late cuneata, terminale late cuneatum, argute dupliciter v. 

 partim simpliciter serrata dentibus acuminatis apice glandulosis, 0.6-2 

 cm. longa et 0.4-1.3 cm. lata, supra laete viridia, glabra, subtus palli- 

 diora, ad costam mediam sparse adpresse pilosa ceterum glabra, nervis 

 vix elevatis obsoletis; petioli 1-2 cm. longi, ut rhachis glabri, sparse 

 V. sparsissime stipitato-glandulosi et aciculis paucis rectis gracilibus ad 

 3 mm. longis muniti; stipulae 1-1.5 cm. longae, latae, margine glan- 

 duloso-ciliatae ceterum glabrae, auriculis triangularibus acuminulatis 

 patentibus. Flores rosei v. pallide rosei, 3.5-4 cm. lati, in apice ramu- 

 lorum lateralium solitarii; pedicelli graciles, 1.5-3 cm. longi, glandu- 

 loso-setosi, apicem versus glabrescentes, basi ebracteati; receptaculum 

 ovoideum v. oblongo-ovoideum, glabrum; sepala ovato-lanceolata, in- 

 tegra, sensim in acumen longum apice foJiaceum et glanduloso-serrula- 

 tum producta, tota 1.5-2.5 cm. longa, post florationem patentia; petala 

 orbiculari-obovata, rotundata v. leviter emarginata, sepalis subaequi- 

 longa; stamina numerosa, antheris ochraceis ovalibus; capitulum 

 stigmatum sessile v. fere sessile; styli pilosi. Fructus desideratur. 



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

 woodlands, alt. 3300-4500 m., July 4, 7, 1908 (No. 3583, type) ; west of 

 Tachien-lu, Cheto-shan, alt. 3800 m., July 25, 1908 (No. 3583^); same 

 locality, 1911, John R. Muir. 



This Rose has no close relationship with any other Chinese Rose. It somewhat 

 resembles R. Sweginzowii Koehne, but differs in the slenderer pedicels, in the entire 

 sepals and chiefly in the absence of the bracts at the base of the pedicel. By the 

 latter character the species is removed from the group of Cinnamomeae and must 

 be referred to the Pimpinellifoliae. From R. spinosissima Linnaeus it differs 

 chiefly in the doubly serrate leaflets and in the elongated receptacle. The fruit is 

 unknown. 



Rosa Hugonis Hemsley in Bot. Mag. CXXXI. t. 8004 (1905). — 

 Fedde, Rep. Spec. Nov. III. 186 (1906). — Willmott, Gen. Rosa, 

 II. 279, t. (1911). — Bean, Trees & Shrubs Brit. Isl. II. 429, fig. 

 (1914). 



Rosa xanthina Crepin in Bull. Soc. Bot. Ital. 1897, 233 (non Lindley), exclud. 

 synon. 



