Oedeb 4'?.— rosacea. 



339 



19. RUMBUS, L. Beamble. (Celtic rub, red ; the color of the fruit 

 of some species.) Calyx spreading, 5-parted ; petals 5, deciduous; sta- 

 mens (x>, inserted into the border of the disk ; ovaries many, with 2 

 ovules, one of them abortive; achenia pulpy, drupaceous, aggregated 

 into a compound berry ; radicle superior. — il Half shrubby plants. Sts. 

 usually ©, and armed with prickles. Inflorescence imperfectly centri- 

 *Tigal. Fi'. esculent. 



§ Fruit insepamblo fi-om tlio juicy, deciduous reoeptaclo. Elackbeekiks (a) 



a Stems (mostly) erect, stout, armed with stout, recurved prickles Nos. 1, 2 



a Stems procumbent, trailing, mostly witli slender, minute prickles Nos, 3 to' 5 



§§ Fruit separating from tlie dry, persistent receptacle. Raspbereieb (b) 



b Leaves simple, lobed. Not prickly ^ Nos. 6 to 8 



b Leaves compound. — Stems not prickly, lierbaceous No. 9 



—Stems prickly, shrubby.— Corolliis single Nos.' 10—12 



— Corollas double No. IS 



1 R. villdsus Ait. High Blackbeeet. Pubescent, viscid and prickly ; st. an- 

 gular ; Ifis. 3 to 5, ovaie, acuminate, serrate, hairy both sides ; petioles prickly ; cal. 

 acuminate, shorter than the petals ; rac. leafless, about 20-flowered. — A well known, 

 thorny shrub, Can. and TJ. S. Sts. tall and slender, branching, recurved at top, 

 3 to 6f high. Lfts. 2|- to i' by 1-J- to 2-J-', terminal one on a long petiolule, the 

 others on short ones or none. Pedicels slender, 1' long. Petals white, obovate 

 or oblong, obtuse. Pr. consisting of about 20 roundish, shining, black, fleshy 

 carpels, closely connected into an ovate or oblong head, subacid, well-flavored, 

 ripe in Aug. and Sept. 



/3. FEONDosus Torr. Lfl:s. incisely serrate ; rao. with a few simple Ivs. or leafy 

 bracts at base ; fis. about 10 in each cluster, tlie terminal one opening first, 

 as in all the species, the lowest next, and the highest but one last. Pr. more 

 acid and with fewer carpels. (E. frondosus Bw.) 



y. IIUMIFUSUS T. & G-. St. procumbent or trailing ; Ivs. smaller ; ped. few- 

 flowered. — Often occurs southward with the erect forms, and with E. trivia- 

 lis, from which it is sometimes hard to be distinguished. 



2 R. cuneifolius Ph. Sand Elaokbeeey. St. erect, shrubby, armed with re- 

 curved prickles; Ivs. 3-foliate, and with the young branches and pet. pubescent 

 beneath ; lfts. cuneate-ohovate, entire at hose, dentate above, subplicate, tomentous 

 beneath ; rac. hose, few-flowered. — A low shrub, 2 to 3f high, in sandy woods, L. I. 

 to Pla. Petioles often prickly. Lfts. rarely 5, 1 to 2' long, -J as wide, obtuse, 

 or with a short acumination. Petals white or roseate, 3 times as long as the cal. 

 Pr. black, juicy, well-flavored, ripe in Jl., Aug. Pis. May, Ju. 



3 R. hfspidiis L. St. slender, reclining or prostrate, hispid with retrorse brisiks ; 

 Ivs. 3-foliate, rarely quinate, smooth and green both sides ; lfts. coarsely serrate, 

 obovate, mostly obtuse, thickish, persistent ; ped. corymbouss, many flowered, with 

 filiform pedicels and short bracts ; fls. and fr. small. — In damp woods, Can. to Car. 

 Sts. slender, trailing several feet, with subereot branches 8 to 12' high. Lfts. 1 to 

 2' long, -J- as wide, nearly sessile, persistent through the winter. Fls. white. Fr. 

 dusky-purple, sour. May, Jn. (E. sempervirens Bw.) 



p. sETosus T. & Gr. Lifts, oblanceolate, rather narrow, IJ to 2-J-' long, tapering, 

 and (hke variety a) entire at base, sharply serrate above. Fr. red. (E. seto- 

 sus Bw.) 



4 R. Canadensis L. Noetheeh Deweeeet. St. procumbent or trailing, a 

 little prickly ; Ivs. 3-foliate, rarely quinate, Ifis. elliptical or rhomboid-oval ckcute or 

 acuminate, thin, unequally cut-serrate; pedicels sohtarj-, elongated, somewhat 

 oorymbed; fr. large, black. — Common in dry, stony fields, Can. to Va., trailing 

 several yards upon the ground. Lfts. light green and membranous, nearly sessile, 

 1 to 1|' long, -J- as wide. Pis. large, on slender pedicels. Petals obovate, white, 

 twice as long as the calyx. iPr. -J- to 1' diam., very sweet and juicy in Jl. and 

 Aug. Fls. May. (E. trivialis Ph.) 



5 R. trivialis Mx. SonTHEEN Dewbeeet. Procumbent, trailing, with root- 

 ing runners, shrubby, armed with brisUes and recurved prickles ; Ivs. 3-foliate and 

 quinate, persistent, Ifis. coriaceous, ovate-oblong or oval, acute or obtuse, sharply 

 serrate; ped. 1 to 3-flowered; fls. large, ^ei. roundish-obovate ; sep. oblong, obtuse, 



