32 BOTANICAL GAZETTE [JULY 
of species. For their benefit I have prepared an analytical key 
or dichotomous table. In it I will not include species of the sec- 
tion CAROLINA, or R. setigera Michx., which belongs to the sec- 
tion SynstyL&. I will confine myself to the CINNAMOMEA, includ- 
ing with them RX. minutifolia Engelm., from Lower California, 
which constitutes by itself the monotypic section MINUTIFOLIA. 
ANALYTICAL Key TO THE RosES OF THE WESTERN STATES. 
1 Inflorescences always one-flowered, without bracts ; exterior sepals 
appendiculate from the base, with the appendages incised or 
denticulate; leaflets incised ; oo with long silky 
pubescence - . - - R. minutifolia Engelm 
Inflorescences one or many-flowered; pedicels with one or 
more bracts; exterior sepals entire or with one or two small 
entire and erect appendages at the summit; leaflets toothed ; 
receptacles smooth or clothed with pedicellate glands ‘ 
2 Flowering branchlets more or less ussite with scattered seta- 
ceous prickles - - - 
Flowering branchlets unarmed - + z ‘ - 7 
Flowering branchlets with pices es ego. under the 
eaves - 
3 Corolla very small (15 to 20™ in diameter); calyx detaching 
: itself in a single piece during ripening, leaving the receptacles 
open at summit; akenes not very numerous; leaflets thin, 
glabrous, with glandular compound teeth - A. gymnocarpa Nutt. 
Corolla usually much exceeding 20™ jin diameter; sepals 
erect upon the fructiferous and persistent receptacles - ~~ 
4 Inflorescences ordinarily one- -flowered; leaflets oval, broadly 
rounded at base, with glandular Srksoundl teeth 
R. acicularis Lindl. 
Inflorescences usually many-flowered ; leaflets often more or less 
attenuate at base, with teeth usually simple - : : 
5 Corolla rather small (about a0" ih diameter); leaflets oval- 
paksee — oes outside ; oo and bracts strongly den- 
ticulat < : R. gratissima Greene 
Corolla rather large ; leaflets obovate, ei! narrowed or cuneate 
at base ; bracts usually entire : 
