ROSA 



i:>49 



2149. A spray of Rose hips. 



BE. Fls. solitary, without bracts, only 

 occasionally corymbose; sepals 

 erect, persistent. 



F. Sepals entire: Ivs. on the flowering 

 branchlets usually 9-foliolate: 

 prickles straight, slender, scat- 

 tered, usually mixed with 

 bristles: fls. white or yellow, 



rarely pink 



SECTION IX. PIMPINELLIFOLI^E (Species No. 42) 

 FF. Sepals pinnate at the outer 

 edges: Ivs. on flowering branch- 

 lets 5-7-foliolate. 

 Prickles straight or hooked, rather stout: fls. ycl- 



loic SECTION X. LUTE^E (Species Nos. 43,44) 



Prickles slender, straight: fls. pink or white: Ifts. 



not over % in. long, incised 



SECTION XII. MINUTIFOLI^E (Species Nos. 46,47) 

 DDD. Lvs. of flowering branchlets 11-15- 



foliolate. 



Prickles regularly in pairs below the base of 

 petiole: inflorescence corymbose: fr. large, very 



prickly 



SECTION XV. MICROPHYLU<E (Species No. 50) 



SUMMARY OF SECTIONS. 



Number. Name. Species. 



I SYSTYL^E 2-8 



II STYLOS^E 9 



III INDICT 10-13 



IV BANKSIJE 14, 15 



V GALLICS 16-19 



VI CANINJE 20-23 



VII CAROLINA 24-28 



VIII ClNNAMOME^E 29-41 



IX PlMPINELLlFOLJyE 42 



X LUTE^E 43,44 



XI SERICE^E 45 



XII MINUTIFOLI..E 46, 47 



XIII BRACTEAT^E 48 



XIV L^EVIGAT^E 49 



XV MlCROPHYLL/E 50 



SUBGENUS HULTHEMIA. Only one Asiatic species, 

 distinguished from all other Roses by the simple, 

 exstipulate leaves. 



1. Persica, Michx. (R. simplicifblia , Salisb. R.ber- 

 berifdlia, Pall. Lowea berberifolia , Lindl.). Low 

 straggling shrub, 2 ft. high, with slender, prickly 

 branches : Ivs. short-petioled, oval to oblong, acute at 

 both ends, serrate, bluish green, pubescent, %-!% in. 

 long r fls. solitary, yellow, with red eye, about 1 in. 

 across: fr. prickly. June. N. Persia to Siberia. B.M. 

 7096. B.R. 15:1261. G.C. III. 6:8, 9, 78. -This peculiar 

 Rose is very rare in cultivation, since it is very difficult 

 to grow. It has been successfully cult, in a cool green- 

 house, exposed to the full sun, kept moist during sum- 

 mer and dry from October to March. The only way to 

 propagate it seems to be by suckers; seeds are occa- 

 sionally introduced from its native country. A hybrid of 

 this species with R. involucrata is R. Hdrdii, Cels., 

 with 5-7-foliolate Ivs. and large yellowish white fls.. 

 with a deep orange eye. G.C. II. 24:469. Gn. 19, p. 473 

 (as R. simplicifolia) . P.M. 10:195. 



SUBGENUS EUROSA. 



SECTION I. SYSTYL*. A group of about It species 

 (one of them American), well marked by the styles 

 being connate into a slender exserted column Stems 

 sarmentose or climbing, with hooked prickles fls in 

 corymbs, few or many: outer sepals pinnate, rarely 

 entire, reflexed after flowering, caducous. 



KEY TO SPECIES OF SECTION I. 

 A. Stipules pectinate: prickles usually 



inpairs 2 . multfflor* 



AA. stipules entire or denticulate: 



prickles scattered. 

 B. Lvs. of flowering branches 3-5- 



foliolate, pubescent beneath 3. Watsoniana 



4. se tiger a 



BB. l^vs. of flowering branchlets usu- 

 ally 9, glabrous 5. Wichuraiana 



BBB. Lvs. of flowering branchlets 5-7- 

 foliolate, 



C. Sepals ovate, abruptly acumi- 

 nate: fl.-buds broadly ovate, 

 abruptly pointed : corymbs 



usually few-fid 6. semperviren* 



7. arvensis 



CC. Sepals lanceolate, gradually 

 acuminate : fl. - buds elon- 

 gated: corymbs usually 

 many-fid 8. moschata 



2. multiflbra, Thunb. (R. polydntha, Sieb. & Zucc. 

 R. intermedia, Carr. R. Wichurce, Koch). Deciduous 

 shrub, with vigorous, long, recurving or climbing 

 branches: Ifts. usually 9, obovate to oblong, acute or 

 obtuse, serrate, pubescent, %-!% in. long: fls. in many- 

 fld. pyramidal corymbs, usually white, % in. across or 

 more; sepals ovate, abruptly acuminate; styles glabrous : 

 fr. small, globular. June. Japan, China. B.M. 7119. 

 G.F. 3:405; 4:535; 6:316,317. A.G.18:677. A.F.6:1003. 

 Gn. 49, p. 368 (as R. microcarpa); 55:432. Gng. 5:120, 

 121. Var. Thunbergiana, Thory, is the typical form, 

 with small white single fls. Var. carnea, Thory (var. 

 plena, Dipp. R. fldrida, Poir.). With double light pink 

 fls. B.M. 1059. B.R. 5:425. Var. platyphylla, Thory, 

 with larger Ivs. and larger double, deep pink fls., is per- 

 haps a hybrid. B.R. 16:1372. Many other hybrids have 

 originated in cultivation; they usually show their par- 

 entage by the pectinate stipules. A hybrid with R. 

 rugosa is R. Itvdra, Sieb., with single, rather small 

 fls. JR. polydntha, Hort., not Sieb. & Zucc., is a trade 



2150. Section of Rose floweis IX 

 To show two forms of styles. 



name for hybrids with R. Chinensis. Gn. 29:530. The 

 Dawson Rose, or R. Dawsoniana, is a hybrid with 

 General Jacqueminot. A very beautiful hybrid and one 

 of the best climbing Roses is Crimson Rambler (Fig. 

 2151), a vigorous grower, with large corymbs of bright 



