ROSACEAE. — ROSA 343 



of the two yellow-flowered Roses found in China this is the one which agrees with 

 Lindley's brief description. On our specimen the leaflets are obtusely and often 

 doubly serrate and reticulate on the upper side, with few shining gland dots on the 

 under side; the prickles are straight, flattened-subulate, 1.5 cm. long, very slightly 

 dilated at base and very woolly. The nature of its prickles, the absence of setae, 

 the large flowers and more prominent stipules distinguish this Rose from R. Hugonis 

 Hemsley. 



Rosa Ecae Aitchison (in Jour. Linn. Sac. XVIII. 54 [1880]; in XIX. 161, t. 8 

 [1882]), which is figured as R. xantUna by Hooker f. in Bot. Mag. CXXV. t. 7666 

 (1899) and by Miss Willmott {Gen. Rosa, 277, t. [1911]), we consider a distinct spe- 

 cies. It agrees with our R. xanthina, f . normalis in the absence of setae, but has much 

 smaller prickles much more dilated at the base and long-pedunculate flowers. 

 We have seen specimens from the Kew plant which was raised from seed collected 

 by Aitchison and have specimens from Samarkand (mountains near Kulikalan, 

 alt. 3000 m., July 10, 1910 [No. 555], and near Pasronte, alt. 2000 m., July 11, 

 1910 [No. 556]), collected by F. N. Meyer. 



From his description we do not think R. platyacantha Schrenk in Bull. Acad. 

 Sci. St. Petersbourg, X. 254 (1842), collected by him in Songaria, has any relation to 

 R. Ecae Aitchison or the wild form of Lindley's R. xanthina. In the setae on the 

 shoots it is near R. Hugonis Hemsley, but the leaflets differ in shape and serrature; 

 Schrenk does not mention the color of the flowers, and very probably his plant is 

 only a geographical variant of R. spinosissima Linnaeus. 



Sect. 9. PIMPINELLIFOLIAE DC. 

 Clavis specierum. 



Flores rosei, graciliter pedicellati. Foliola duphciter serrata, breviter sed manifeste 

 petiolulata. Aculei graciles 40. R. graciliflora. 



Flores lutei, breviter pedicellati. FoUola simphciter serrata, subsessilia. Aculei 

 basi valde dilatati 41. iJ. Hugonis. 



Enumeratio specierum. 



40. R. graciliflora Rehder & Wilson. See p. 330. 



41. R. Hugonis Hemsley. See p. 330. 



Sect. 10. SERICEAE Cr4p. 

 Clavis specierum. 



Foliola supra glabra, subtus sericea v. glabra, plerumque ovalia v. oblonga, 5-17. 



Receptaculumglabrum. Fructus pedicello carnoso aurantiaco. 42. R. omeiensis. 

 Foliola utrinque sericeo-lanuginosa, plerumque obovata, 5-7. Receptaculum 



sericeum 43. /2. Mairei. 



Enumeratio specierum. 



42. Rosa omeiensis Rolfe. See p. 331. 



Rosa omeiensis, var. pteracantha Rehder & Wilson. See p. 332. 



43. Rosa Mairei L6veill6 in Fedde, Rep. Spec. Nov. XI. 299 (1912). — Willmott, 

 Gen. Rosa, II. 521 (1914). 



