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. biformispinus. 

 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 30. 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 

 Sepals dorsally glandular-hispid. 



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



ilar bristles among the abundant pr 

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



glandular bristles among the abundant prickles . . .31. R. permixtus. 





and without glandular bristles 82. R. tttrdatuti. 



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



k. 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. hispid us. 



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. trivia Us. 



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



hairs; peduncles o-several-flowered . . . . " . 36. R. rubr-isetuf;. 

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



none. 



Leaflets of first year's growth finely and doubly serrate . . 3T. R. iyillo$u,K. 

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



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; flowers 

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

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

 lets, of good flavor. (R. mllosus 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 ALBINUS (Bailey) Fernald (WHITE BLACKBERRY) has 

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

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



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

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



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, with few drupelets. Stratton, Vt. 



11. R. jiinceus 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. glandicaulis 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 

 30-00 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 pedicel* rcrij 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 



