ROSACEAE (rose FAMILY) 480 



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.hiformispinuH. 

 Canes armed with nearly uniform and very numerous setae. 

 Pedicels and sepals with numerous and conspicuous gland- 

 tipped setae 29. ^. setosu^s. 



Pedicels and sepals minutely and obscurely glandular-pu- 

 bescent or glandless, their bristles free from glandularity 30. R. nigricans. 

 m. 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 . . .31. R. permixtus. 

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



and without glandular bristles . . . . ' . . S2. R. ttcrdatus. 



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



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 34. R. hispidua. 



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. irivialis. 



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



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



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

 none. 

 Leaflets of first year's growih finely and doubly serrate . . 37. R. tilloHtin. 

 Leaflets of first year's growth coarsely and simply serrate . 38. R. invisua. 



9. R. allegheniensis 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; flowei-s 

 2.5-3.5 cm. broad, racemose, only the lower leafy-bracted ; petals narrowly 

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

 lets, of good flavor. (B. villosus Man. ed. (3. in large part, not Ait.; JR. nigro- 

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

 C, common. Forma albinds (Bailey) Fernald (White Blackberry) has 

 amber-colored fruit, ^'a^. calyc6sus Fernald. Sepals elongated and leaf-like ; 

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



Var. Grav^sii Fernald. Unarmed ; canes paler, mostly greenish ; inflores- 

 cence much elongated (2-3 dm.) — Ct. (Gi'aves). 



10. R. flavinanus Blanchard. Erect. 5-10 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, icith few drupelets. — Stratton, Vt. 



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

 weak, 6-9 dui. 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 di-upelets. — Dry open places, York Co., 

 Me. 



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

 glandular-hispid and with mnnerous 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, frondis^ntis 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 .^trai>/hti.sh 



