498 FLOKA. + 



sterile shoots; corymbs few -flowered, with rather elongated pedicels; sep,is with 

 long tips; fruit globular-oblong. N. Y. to Ala. and Kans. June-July. [R, Cana- 

 densis var. invisus Bailey.] 



22. Rubus roribaccus (Bailey) Rydb. LUCRETIA BLACKBERRY. Stem very 

 stout, terete, with weak straight prickles. Young shoots and inflorescence decidedly 

 villous-glandular; leaves as those of the preceding, but less acuminate, sharply 

 doubly serrate, thinner and greener; inflorescence many-flowered, leafy -bracted; 

 flowers large, 3-5 cm. in diameter; petals generally broadly obovate ; sepals nearly 

 always foliaceous with a lanceolate base; fruit oblong-globose. Va., W. Va. and 

 Perm. May-July. [7v. Canadcnsls var. roribaccus Bailey.] 



23. Rubus pro-u.nbens Muhl. Low RUNNING BLACKBERRY. DEWBERRY. 

 (I. F. f. 1906.) Trailing, shrubby; stem armed with scattered prickles or nearly 

 naked. Branches erect or ascending, 1-3 dm. long, more or less pubescent, 

 sometimes slightly glandular; leaves petioled, 3-7-foliolate; leaflets ovate, oval or 

 thin, obovate, acute or sometimes obtusish at the apex, rounded or narrowed at the 

 base, sharply dentate-serrate, usually sparingly pubescent; white, about 25 mm. 

 broad; fruit black, delicious, often 25 mm. long. In dry soil, Newf. and Out. to 

 Lake Superior, Va., La. and the Ind. Terr. April -May. Fruit ripe June-July. 

 [R.Canadensis T. & G., not L. ] 



24. Rubus subuniflorus Rydb. ONE-FLOWERED DEWBERRY. Like the pre- 

 ceding, but soon glabrate throughout; branches very slender; flowers 3-4 cm. 

 broad, mostly solitary, on long axillary peduncles in fruit fully as long as the 

 leaves; prickles very weak; fruit small, hemispheric, i cm. long or less, of few 

 large grains. In habit intermediate between the preceding and the following, 

 but the flowers larger than in either. Sandy or dry soil, near the coast from 

 Me. to S. Car. May-July; fruit July-Sept. [R. villosus Ait. 1789; not Thunb. 



1784-] 



25. Rubus Ensleni Tratt. ENSLEN'S DEWBERRY. Slender, trailing, glabrous 

 throughout, sparingly armed with reflexed prickles. Leaves small, 2-4 cm. long, 

 obovate-cuneate or the terminal one rhombic-cuneate, entire at the base, crenate- 

 dentate or crenate -serrate above, acute; flowers small, about 15 mm. broad; sepals 

 narrowly ovate, mucronate; fruit small, of few drupelets. Woods in the South 

 from Kans. (?) to Miss, and Ala. March-April. 



26. Rubus Baileyanus Britton. BAILEY'S BLACKBERRY. (I. F. f. 1905.) 

 Stem trailing or ascending, sparingly prickly, 1-2 m. long. Leaflets broadly 

 ovate or oval, pubescent, at least on the lower surfa.ce, mostly rounded or cordate 

 at the base, acute or obtuse, the uppermost leaves almost invariably unifoliolate ; 

 flowers few, rather large, 2-3 cm. broad; fruit small. In dry woods and thickets, 

 Me. to N. Y. and Va. May-June. 



27. Rubus nigricans Rydb. PECK'S DEWBERRY. (I. F. f. 1903.) Decum- 

 bent, with stout bristles. Shoots suberect, often 3 dm. high, the sterile ones very 

 bristly, with stout reflexed bristles or slender prickles; leaves of the sterile shoots and 

 the lower ones of the fertile 5-foliolate; leaflets petioled or the lower subsessile, obo- 

 vate or oval, acuminate, sharply serrate, dark green; inflorescence racemose, leafy- 

 bntcted; flowers about 15 mm. broad; sepals lanceolate; fruit hemispheric, about 

 i cm., at first red, but nearly black when fully ripe. Open grounds, Newf. to 

 Mich., south to Penn. \R. hispidus var. suberectus Peck; not R, suberectiis An- 

 ders.; R. setosus of 111. Fl., in part.] 



28. Rubus setosus Bigel. BRISTLY BLACKBERRY. Similar to the next 

 following species but stouter; stems ascending or decumbent, the older parts 

 densely clothed with slender slightly reflexed bristles. Lower leaflets generally 5, 

 3 in those of the flowering branches, oblanceolate, mostly acute or short-acuminate 

 sometimes 5 cm. long, short-stalked or sessile; flowers 12-18 mm. broad, race 

 mose; fruit small, sour. E. Mass. July- Aug. 



29. Rubus hispidus L. HISPID OR RUNNING SWAMP BLACKBERRY. (I. F. f. 

 1902. ) Stems slender, slightly woody, creeping, more or less densely beset with 

 weak bristles. Branches erect or ascending, 1-3 dm. long, naked; leaves petioled, 

 3-foliolate; leaflets obovate, obtuse, thick, persistent, narrowed at the base, 1-4 

 cm. long, sharply serrate above the middle; peduncles terminal or axillary, nearly 

 or quite leafless; flowers corymbose, white, 10-14 mm. broad; petals exceeding 

 the sepals; fruit red, nearly black when ripe, sour, usually less than I cm. long, 



