516 ROSACEAE 
Fruit falling away from the dry receptacle: petals erect. (Raspberries. ) 
Stems ee: glaucous: fruit purple-black or black. 
Stems bristly, not glaucous: fruit light red. 
Fruit persistent on a fleshy receptacle: petals spreading. ( Blackberries.) 
Stems erect, ascending or recurved. 
Leaf-blades white-woolly beneath, 3. R. cuneifolius. 
Leaf-blades not white-woolly beneath. 
MONETA of the inflorescence and the petioles distinctly glandular-pu- 
escent. 
Fruit broadly oval or nearly spherical, very juicy. 
Fruit narrowly oblong or thimble-shaped, comparatively dry. 
Branches of the inflorescence and petioles villous, strigose or nearly 
glabrous, scarcely glandular. 
Pubescence copious in the inflorescence. 
Terminal leafiet 14 longer than the lateral ones, oblong or oblong- 
. R. occidentalis. 
. R. strigosus. 
Noe 
. R. nigrobaccus. 
. R. Allegheniensis. 
Sus 
an 
ovate. . R. ostryifolius. 
Terminal leaflet slightly longer than the lateral ones, obovate to 
rhombic. 
Prickles of thestem flattened only at the base, straight or slightly 
curved. 7. R. frondosus. 
Prickles of thestem much flattened throughout, strongiy hooked. 8. R. floridus. 
Pubescence sparse in the inflorescence. 
Plants low, almost herbaceous, weakly prickly. 9. R. Rand. 
Plants tall and shrubby. 
Plants strongly prickly. 
Leaflets pubescent beneath, doubly serrate. 10. R. argutus. 
Leaflets glabrous beneath, singly serrate. 11. R. betulifolius. 
Plants unarmed or with few weak prickles. 12. R. Canadensis. 
Stems trailing, creeping or decumbent. 
Leaflets thin, membranous: leaves deciduous. 
Stems merely prickly. 
Inflorescence usually several-many-flowered. 
Corolla generally over 3 em. broad: inflorescence usually glandu- 
liferous: terminal leafiets of the shoots rounded at the base. 
Leaflets simply serrate. 13. R. invisus. 
Leafiets doubly serrate. 14. R. roribaccus. 
Corolla generally less than 3 em. broad: inflorescence not glandu- 
liferous : terminal leaflets of the shoots cuneate or obtuse at 
the base. 
Terminal leaflet 14 longer than the lateral ones, oblong or oblong- NS 
ovate, acute. 6. R. ostryifolius. 
Terminal leaflet slightly longer than the lateral ones, ovate, acu- 
minate. 
Leaflets mostly acute or acuminate, glabrous or somewhat 
pubescent beneath : peduncles slightly villous. 15. R. procumbens. 
Leaflets mostly obtuse, tomentulose beneath: peduncles 
densely tomentulose or tomentose. 6. R. rhodophyllus. 
Inflorescence usually 1-2-flowered. 
Lateral leaflets cuneate at the base, glabrous. 
Leaflets sharply serrate with triangular teeth. 17. R. subunifiorus. 
Leaflets crenate-serrate with ovate teeth. 18. R. Enslenü. 
Lateral leaflets rounded at the base, pubescent beneath. 19. R. Baileyanus. 
Stems bristly and prickly, sometimes merely bristly. 
Flowering branches and petioles bristly or glabrous: terminal leaflets, 
d n å i 20. R. hispidus. 
owering branches and petioles prickly : terminal leaflets oblong-el- ERE 
liptic. E 5 : E 21. R.;carpinifolius. 
Leaflets leathery : leaves persistent, evergreen. : mcn 
Corolla 1-1.5 em. broad. 20. R. hispidus. 
Corolla 2-3.5 em. broad. 
Flowering branches usually simple and 1-flowered. 
Fiowering branches usually corymbosely branched and several-flow- 
ered. 
Pedicels not bristly under the hypanthium : stems with recurved ; 
i y vs 23. R. persistens. 
. R. trivialis. 
B 
prickles. 
Pedicels densely bristly under the hypanthi : stems with straight 
$ pers aid sic Maan rtd ae sewer! cari ie ji 24. R. rubrise = . 
1. Rubus occidentalis L. A straggling shrub, with cane-like glaucous prickle- 
armed branches 1-3 m. long, curved, sometimes rooting at the end. Leaves pinnately 2- 
foliolate, or rarely 5-foliolate: blades of the leaflets ovate to obovate, 2-8 cm. long, acute 
or acuminate, incised-serrate, sometimes lobed, cuneate or subcordate at the base : flowers 
not showy, in terminal corymbs: sepals oblong-ovate or ovate-lanceolate, 5-6 mm. Rages 
acuminate : petals white, spatulate or cuneate-spatulate, 4-5 mm. long, obtuse: fruit de 
pressed-hemispheric, black or purple-black, 8-12 mm. broad. 
On the borders of woods and in rocky thickets, Quebec to Ontario, northern Georgia, Alabama 
and Missouri. Spring. BLACK RASPBERRY. BLACK-CapP. 
2. Rubus strigdsus Michx. A branching shrub, 1-2 m. tall, with curved beer 
and more or less densely bristly foliage. Leaves pinnately 3-5-foliolate: blades 0 ; 
leaflets ovate to oblong-ovate or ovate-lanceolate, rarely elliptic, 2-8 cm. long, —— 
acuminate, slightly serrate, sometimes slightly lobed, glabrous above or nearly so, W » i 
tomentose beneath, usually rounded at the base: flowers in loose racemes or panic e: 
