1921] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 11 



This is the only glabrous species of the Macracanthae which has been 

 found in the region west of the Mississippi River. Glabrous species in 

 this group are not common anywhere and of them I have seen only C. 

 bristolensis Sargent with ten stamens and rose-colored anthers and C. 

 Emersoniana Sargent with ten stamens and yellow anthers, both from 

 Bristol County, Massachusetts, and C. venustula Sargent from western 

 New York and Ontario with ten stamens and yellow anthers. The other 

 Macracanthae with glabrous corymbs have more or less hairy leaves or 

 calyx-lobes viilose on the inner surface. 



(To be continued) 



NEW SPECIES, VARIETIES AND COMBINATIONS FROM THE 



HERBARIUM AND THE COLLECTIONS OF THE 



ARNOLD ARBORETUM* 



Alfred Rehder 

 ROSACEAE (continued) 



X Rosa Barbierana, nom. nov. (R. multiflora var. cathayensis" Crimson 

 Rambler" X Wichuraiana). — R. Wichuraiana rubra Andr6 in Rev. Hort. 

 1900, 385; 1901, 20, t. 



This handsome climbing Rose was raised by Barbier & fils, Orleans, 

 France, from seeds of R. Wichuraiana fertilized by "Crimson Rambler"; 

 it produces in great abundance single carmine flowers 3-4 cm. across. 



X Rosa Paulii, nom. nov. ( R. arvensis X rugosa). — R. rugosa repens 

 alba Paul & Son apud F. in Gard. LIV. 279 (1910). — Darlington in 



Rose Annual, 1915, 43. 



Shrub with long creeping or sarmentose stems densely covered with 

 slender straight prickles and bristles; stem and prickles glabrous. Peti- 

 oles and rhachis pubescent, sparingly prickly and glandular-bristly; 

 stipules very large, sparingly glandular-ciliate; leaflets 5-7 on flowering 

 branchlets, 7, rarely 9 on shoots, elliptic to obovate, 2-4 cm. long, acute 

 or abruptly acute, coarsely serrate, glabrous, dark green and slight- 

 ly rugose above, pale green beneath and pubescent on the veins and vein- 

 lets; stipules sparingly and minutely denticulate. Flowers white, about 

 7 cm. across in 5-12-flowered corymbs; peduncles densely prickly; pedicels 

 densely covered with glandular bristles interspersed with a few slender 



prickles; receptacle glandular-bristly; sepals ovate-lanceolate, long- 

 acuminate, usually entire, stipitate-glandular on the back; petals obovate, 

 emarginate; styles exserted, free, glabrous. 



2 Continued from vol. II, p. 180. 



