64 Spring Flora of Ohio. 



9. Genus RU'-BUS. — Calyx 5-parted, without bractlets; achenes 

 usually many on a spongy or succulent receptacle; perennial herbs or 

 somewhat shrubby. 



A. Fruit falling off whole from the dry receptacle when ripe, or consisting of 

 fezv grains ivhich fall separately. 



(b. Leaves simple, floivers large, prickles tione. 



Ru'-bus o-do-ra'-tus L. Purple- Flowering Raspberry. — Leaves 3-5- 

 lobed ; flowers showy, 2 in. broad, purple rose-color. 



b. Leaflets j-j, petals small, erect, 7chitr, 



Ru'-bus a-mer-i-ca'-nus (Pers.) Brit. (A', (rijlonts Rich.) Dwarf Rasp- 

 berry. — Stems ascending (()-12 in. high) or trailing, not prickly; leaf- 

 lets 3 (or 5), acute at both ends, coarsely doubly-serrate, thin ; peduncle 

 1-3-flowered. 



Ru'-bus stri-go'-sus Mx. Red Raspberry. — Stems upright, beset with 

 stiff straight bristles (or a few weak hooked prickles), glandular when 

 young, somewhat glaucous; petals as long as the sepals; fruit light-red. 



Ru'-bus oc-ci-den-ta'-lis L. Black Raspberry. — Glaucous all over; 

 stems recurved, with hooked prickles, not bristly ; petals shorter than 

 the sepals ; fruit purple-black. 



A. Fruit not separating from the Juicy, prolonged i-eceptacle. 



(c. Stems upright or reclining, hranchlets and loiver suiface of leaves hairy 

 and glandular. 



Ru'-bus vil-lo'-sus Ait. Common or High Blackberry. — Stems furrowed, 

 1-6 ft. high, armed with stout, curved prickles ; flowers racemed, 

 numerous , petals obovate-oblong. 



Ru'-bus vil-lo'-sus fron-do'-sus Torn Blackberry. — Differs from the 

 last in being smoother, much less glandular, flowers more corymbose^ 

 bracts leaf}', petals roundish. 



c. .Stems trailing 01- piocunibent ; leaflets nearly O)- guile smooth. 



Ru'-bus can-a-den'-sis L. Dewberry; Low Blackberry. — Shrubby, ex- 

 tensively trailing, slightly prickh-, leaflets 3 (or 5 or 7), oval, or ovate 

 lanceolate. 



Ru'-bus his'-pi-dus L. Running Swamp-Blackberry. — Stem slender, 

 scarcely woody, extensively procumbent, beset with small reflexed 

 prickles; leaflets obovate, obtuse; fruit of a few grains. 



;c. Stems upright, branchlets and loiuer side of leaves whitish-7voolly'. 



