ROSACEAE (ROSE FAMILY) 489 



g. Lower surface of the leaflets green and essentially glabrous. 



Canes armed with few firm prickles mixed with numerous 



setae ; pedicels with gland-tipped setae . . . . 28. R. biformispinua. 

 Canes armed with nearly uniform and very numerous setae. 

 Pedicels and sepals with numerous and conspicuous gland- 

 tipped setae 29. R. setosus. 



Pedicels and sepals minutely and obscurely glandular-pu- 

 bescent or glandless, their bristles free from glandularity 80. R. nigricans, 

 *. Canes trailing or at least with a decided tendency to be prostrate 



toward the end h. 



h. Pedicels covered with copious gland-tipped setae. 

 Sepals dorsally glandular-hispid. 

 Stem and petioles of the first year's growth with numerous 



glandular bristles among the abundant prickles . . .81. JR. permixtus. 

 Stem and petioles of the first year's growth less copiously armed 



and without glandular bristles 82. R. tardatus. 



Sepals not dorsally glandular-hispid 33. R. jacens. 



h. Pedicels not glandular or at most finely and obscurely glandular- 



tomentulose. 



Fruit red or reddish, small ; leaflets subcoriaceous, shining ; flow- 

 ers several, in corymbiform racemes ... . 84. R. hisnidus. 

 Fruit black. 



Prickles much broadened at base ; those of the pedicels numer- 

 ous, strong. 



Petioles, pedicels, etc., scarcely or not at all glandular ; pe- 

 duncles 1-3-flowered 35. R. trivialis. 



Petioles, pedicels, etc., covered with reddish gland-tipped 



hairs ; peduncles 3-several-flowered 36. R. rubrisetus. 



Prickles merely acicular ; those of the pedicels few and weak, or 



none. 



Leaflets of first year's growth finely and doubly serrate . . 87. R. villosus. 

 Leaflets of first year's growth coarsely and simply serrate . 88. R. inmsus. 



9. R. allegheniSnsis Porter. Shrubby, 1-2 m. tall ; old canes purplish, 

 armed with stout straightish prickles ; leaflets appressed-villous above, velvety 

 beneath; branchlets, pedicels (unarmed), etc., glandular-pubescent; flowers 

 2.5-3.5 cm! broa.d, racemose, only the lower leafy-bracted ; petals narrowly 

 obovate; fruit (rarely pale) generally subcylindric, of many v rather small drupe- 

 lets, of good flavor. (R. villosus Man. ed. 6, in large part, 'not Ait.; R. nigro- 

 baccus Bailey.) Dry open thickets and recent clearings, N. S. to Ont. and N. 

 C., common. Forma ALBINOS (Bailey) Fernald (WHITE BLACKBERRY) has 

 amber-colored fruit. Var. CALYc6sus Fernald. Sepals elongated and leaf-like ; 

 fruit dry, abortive. A local sport, N. H. to Va. 



Var. Gravdsii Fernald. Unarmed ; canes paler, mostly greenish ; inflores- 

 cence much elongated (2-3 dm.) Ct. (Graves'). 



10. R. flavinanus Blanchard. Erect, 6-10 dm. high^ old canes reddish, 

 abundantly armed with slender curved prickles; leaflets glabrous above, velvety 

 beneath; pedicels (unarmed) glandular-pubescent; flowers 2-2.5 cm. broad; 

 petals oblong-spatulate ; fruit poor, with few drupelets. Stratton, Vt. . 



11. R. junceus Blanchard. Erect or at length reclining; canes slender, 

 weak, 6-9 dm. high, with weak recurved prickles; leaflets incisely toothed, 

 glabrous above, essentially glabrous beneath ; racemes short, becoming 6-8 cm. 

 long; pedicels (unarmed) glandular-hispid; flowers 2-2.5 cm. broad; petals 

 oblong-spatulate ; fruit globose, of few drupelets. Dry open places, York Co., 

 Me. 



12. R. glandicaiilis Blanchard. Strict ; canes (purplish in age) 1-2 m. high, 

 glandular-hispid and with numerous stout straightish prickles; leaflets glabrous 

 above, velvety beneath ; racemes rather short ; rhachis and pedicels glandular- 

 hispid; flowers 2.5-3 cm. broad ; petals narrowly obovate ; fruit cylindrical, of 

 30-60 small drupelets, of good quality. Dry open places, N. S. to s. Me., near 

 the coast. 



13. R. frondisSntis Blanchard. Erect ; old canes (purplish) slender, 9-15 

 dm. high, closely covered with fine prickles and stalked glands; leaflets mostly 

 large, glabrous above, velvety beneath; racemes short, somewhat corymbiform; 

 rhachis and pedicels very glandular-hispid ; flowers 2-3 cm. broad ; petals nar- 

 rowly obovate ; fruit small, short-cylindric, of few rather large drupelets. Dry 

 open soil, s. w. N. H. and s. e. Vt. 



14. R. frondbsus Bigel. Canes arched-recurving, with stout straightish 



