620 ROSACEAE 
Blades of the lateral leaflet Peny ovate: blade of the ter- 
minal leaflet toothed to the base 
III. ARGUTI 
Inflorescence densely clothed with long-stalked glands. 
Inflorescence glandless, or the se eue glands, if present, 
hidden in the other pubescene 
M d UE leaflets markedly pubescent beneath. 
cence elongate-ramose: young branches more 
pe istinctly angled: prickles ae blades of 
f cn 1 
Inflorescence short-corymbiform : ng branches te- 
rete: prickles at least on the branches eurved and 
fiattened : leaflets Mod e DE ent be neath. 
Prickles ind. y hooked and flattened, at least on the 
flor 
Prickles, ir present, Eum ight and t 
stem tall, "BE usually unarmed. 
Stems T. 1 a ‘tall or "E AQ or nearly SO, 
Sparingly retrorse- priekly ect 
IV. PROCUMBENTES 
Dlades of the leaflets markedly pubescent beneath. 
Prickles strongly flattened and curv 
Prickles terete or nearly so, rather weak 
Bla des oe E leaflets light- -green and firm, shining 
abov gularly toothe 
ee des p tiia M ad dark-green and very thin, irregu- 
arly tooth 
Bl d Ns ue leaflets glabrous or sparingly pubescent on the 
eneath 
Leafiets of the flow vering branches thin, the blades crenate- 
rate with ovate teeth : stem with weak prickles. 
Leaflets of the flowering branches firm, the blades serrate 
with lanceolate teeth: stem with firm prickles. 
V. His 
Plant with slender, prostrate, often Dui ae blades 
of the leaflets thin, but firm, shining above. 
VI. Trivi 
mede m t leaflets of turions ovate, epe or lanceolate, 
serrate with triangular te eth. 
ECs usually several-flowered: stems decidedly 
prickly, but not at all bristly. 
Inflorescence usually 1-flowered: stems usually bristly as 
well as prickly. 
no of the eat ces of turions oval or obovate, doubly 
toothed with ovate teeth. 
Leaflets comparatively thin, turions obtuse or acute, 
Leaflets firm and thick, turions short-acuminate. 
* R. occidentalis L. Stems arching, 3 m. long or less, 
tip, glaucous, the prickles somewhat flattened, recurved: 
3-foliolate or individually ped 5- ed - 
late, ne leaflet-blades o , 5—8 © 
long, double serrate, a lobe d, ae 
ruptly can (c oe rk-green above, white- 
tomentose be neath, inded or co ordate at the 
base: e 3-foli Slate; leaflet-blades similar 
to those the stem but sm aller: corymbs 
ovate-lanceolate sepals: fruit hemi- 
ic, dar lui i 
and thie various provinces, in Coastal 
Plain ig wa Ga. to Colo., Minn., 
and N. B. 
terminal, re EUN peduncles and pedi- 
cels prickly, tomentose: petals shorter than 
E 
c 
FT 
oe 
e g 
15. R. 
17. R. 
18. R. 
19. R. 
20. R. 
often 
leaves 
ve 
Linkiants. 
. nigrobaccus. 
. argutus. 
. floridus. 
. betulifolius. 
. canadensis. 
. Enslenii. 
. rhodophyllus. 
. invisus. 
. Baileyanus. 
Enslenii. 
flagellaris. 
. hispidus. 
lucidus. 
trivialis. 
cont inentalis. 
rubrisetus 
rooting at the 
of the turions 
