ROSACEAE (ROSE FAMILY) 491 



R. MiLLSPxtfoHi Britton, a robust plant of W. Va., is but little known. 

 In technical characters it scarcely differs from the preceding species, of which 

 it may well prove a luxuriant form. 



22. R. LACiNiATiis Willd. Readily recognized by its laciniate-cleft leaflets, 

 prickly calyx, and broad-based pale prickles. Sometimes cultivated and now 

 locally established, s. N. Y., e. Pa., and Del. A plant of unknown origin, 

 perhaps only a cut-leaved form of the European It. fruticosus L. 



23. R. cuneifblius Pursh. (SAND B.) Shrubby, 3-12 dm. high, upright or 

 ascending, armed with stout recurved prickles ; branchlets and lower surface 

 of leaves white-tomentose ; leaflets wedge-obovate, thickish, serrate above the 

 middle; peduncles l^i-flowered ; corolla 2-3 cm. broad. Rocky or sandy soil, 

 Ct. to Fla., La., and Mo. 



24. R. Andrewsianus Blanchard. Erect or arched-ascending, not rooting at 

 the tip, 9-16 dm. high ; old canes stout and stiff, prominently angled and 

 furrowed, purplish, strongly armed with broad-based straight prickles,' leaflets 

 sparingly pubescent above, velvety beneath, rather finely and sharply serrate ; 

 racemes short ; rhachis and pedicels tomentose and glandular-hispid, the latter 

 bearing slender hooked prickles ; calyx somewhat glandular ; flowers 2.5-3 cm. 

 broad ; petals obovate, abruptly narrowed at base to a long claw ; fruit short- 

 cylindric, large, of about 30 juicy drupelets. Sandy plains near the coast, 

 Mass, to Va. 



25. R. floricomus Blanchard. Erect and somewhat rigid, 8-14 dm. high ; 

 canes strongly angled and grooved, greenish or purplish, stoutly armed with 

 long firm straightish needle-pointed prickles , branchlets somewhat tomentose. 

 and as well as the pedicels, petioles, and often midnerves beset with stout 

 hooked prickles; leaves firm, glabrate above, rusty-velvety beneath; leaflets 

 coarsely and sharply toothed; raceme 7-12-flowered, corymbiform ; pedicels 

 widely spreading ; rhachis, pedicels, and calyx softly villous-tomentose ; fruit 

 subglobose, with few rather large drupelets. Southington, Ct. ; (?) Jaffrey, 

 N. H., and (?) Wey bridge, Vt. (Brainerd). 



26. R. Jeckylanus Blanchard. Eecurved-ascending, the branches often root- 

 ing at the tip ; canes subterete, sparingly armed with short slender prickles ; 

 leaves glabrate above, velvety beneath, those of the flowering branches over- 

 topping the corymbiform few-flowered inflorescence; rhachis and pedicels softly 

 tomentose, not glandular, the latter sparingly beset with very fine straight 

 prickles ; leaflets sharply and unequally dentate ; flowers about 3 cm. broad ; 

 petals elliptical ; fruit globose, of few large drupelets. Open places, York 

 Co., Me. 



27. R. abbrdvians Blanchard. Erect, 3-6 dm. high ; the slender terete canes 

 flrm, reddish brown, closely beset with fine straight prickles and gland-tipped 

 bristles ; leaves rather small, smoothish above, velvety beneath ; leaflets on the 

 fruiting canes broadly obovate, coarsely dentate ; racemes short, subcorymbi- 

 form, leafy -bracted at base ; rhachis and pedicels glandular-hispid and setulose ; 

 flowers 2.6 cm. broad; petals narrowly obovate ; fruit short-cylindric, of few 

 large finally sweet drupelets. Uplands of Windham Co., Vt. 



28. R. biformispinus Blanchard. Reclining ; the elongate terete purplish 

 flexuous canes armed with scattered straightish prickles and numerous smaller 

 in part gland-tipped bristles; leaves glabrous on both surfaces ; racemes short, 

 leafy-bracted at base ; rhachis and pedicels glandular-hispid and with scattered 

 hooked prickles; flowers 2-2.5 cm. broad; fruit globose, of few drupelets. 

 Dry open ground, York Co., Me. 



29. R. setbsus Bigel. Ascending ; the terete canes (in age purplish) densely 

 covered with retrorse bristles and shorter gland-tipped hairs; leaves rather 

 large, glabrous on both surfaces, usually equaling or surpassing the corymbi- 

 form several-flowered racemes ; petioles often setulose ; rhachis and pedicels 

 densely glandular-hispid and mostly setose ; flowers 1.5-2.5 cm. broad; petals 

 oblong-spatulate ; f nut subglobose. (. nigricans Rydb., in part.) Meadows 

 and swamps, P. E. I. to Vt. and Ct. 



30. R. nigricans Rydb. Similar, more upright, 6-12 dm. high ; canes armed 

 with numerous fine prickles, but without glands; leaflets glabrous on both 



