1924] REHDER, LIGNEOUS PLANTS OF NORTHERN CHINA, II 209 



As this is the only double-flowered yellow Rose we know from northern 

 China, there can hardly be any doubt that it represents Lindley's R. 

 xanthina based on a Chinese drawing and very briefly described. The 

 plant referred to by Bunge as R. pimpinellifolia and stated to be repre- 

 sented by a cultivated variety "floribus majusculis sulphureis" is probably 

 the double-flowered form and not the single-flowered wild form. 



Rosa xanthina f . spontanea Rehder, nom. nov. 



Rosa xanthina Franchet in Nouv. Arch. Mus. Paris, s6r. 2, v. 269, t. 15, fig. 



2 (PL David, i. 117) (1883).— F. N. Meyer in U. S. Dept. Agric. Bur. PI. 



Indust. Invent. Seeds PI. Imp. xm. 170, no. 21620 (1908).— Dingier in 



Bot. Centralbl. Beih. xxxvu. abt. n. 136 (1919). — Vix Lindley. 

 Rosa eglanteria Graebner in Bot. Jahrb. xxxiv. beibl. lxxv. 40 (1904). 



Non Linnaeus. 

 Rosa xanthina f. normalis Rehder & Wilson in Sargent, PI. Wilson, n. 342 



(1915); quoad syn. Franchetii. — Hers in Jour. N. China Branch R. As. 



Soc. Lin. 115 (1922); Liste Ess. Lign. Honan, 26 (1922). 

 Rosa sp. F. N. Meyer in U. S. Dept. Agric. Bur. PI. Indust. Invent. Seeds 



PI. Imp. xl. 33, no. 38821 (1917). 



Chili: Kalgan, mountain side near Jen tou shan, N. H. Cowdry, no, 

 1498, July 2, 1921. 



Shantung: Tsing tau and Tsang kou (ex Graebner, 1. c., and Dingier, 

 1. c); Shu shan (ex Meyer, 1. c). 



Honan: Chang mao, alt. 600 m., J. Hers, nos. 43, 44, May 10, 1919; 

 Sia shih, J. Hers, no. 336, April 24, 1921. — See also Hers, 1. c. 



Shansi: Fen chow, J. Hers, no. 1906, April 20, 1922; Wu chai hsien, 

 Ta nan kow, alt. 2000-3000 m., Tchuang Kieh, Hers no. 2048, September 

 7, 1922; Nan yang shan, alt. 1000-2500 m., J. Hers, no. 2716, September 

 22-30, 1923. 



Shensi: Yenan fu, W. Purdom, no. 339, 1910; Ta hua shan, F. N. Meyer, 

 no. 2094 a , December 29, 1913 (seeds only; plants growing at Bell, Mary- 

 land; in herb. U. S. Dept. Agric). 



The specimens cited above represent apparently the spontaneous form 

 of the double-flowered R. xanthina; they agree with the specimens of the 

 double-flowered form in shape and serration and in the pubescence of 

 the leaflets which are usually villose beneath at least when young and 

 glandless, rarely quite glabrous. In Plantae Wilsonianae (1. c.) this 

 spontaneous form is confused with R. Ecae which has narrower leaflets, 

 obtusely and more or less doubly serrate from near the base and glandular- 

 dotted beneath but otherwise glabrous. 



The plant growing near Shu shan, Shantung, is according to Meyer's 

 note the wild single-flowered form, but the cultivated plants supposed 

 to have been introduced by Meyer from that locality have semi-double 

 flowers. Hers' no. 336 from Sia shih, Honan, is remarkable for its very 

 pubescent leaves, the leaflets being densely long- villose beneath, sparingly 

 so above and the petioles are also covered with long villose hairs. In 

 most plants the pubescence nearly disappears at maturity or it may be 

 even entirely absent as in Hers* no. 2048 and 2716 from Shansi and in 

 Cowdry's no. 1498 from Chili. 



