2T2 Rosaceae 
A. Flowers solitary, axillary, on long peduncles; leaves palmately 3—5-foliolate. 
LONGIPEDUNCULATAE (p. 214) 
AA. Flowers in cymes. 
B. Cymes very leafy, their leaves hardly reduced, many-flowered. 
C. Leaflets deeply dissected, the basal ones nearly to the base. 
ARENICOLAE (p. 213) 
CC. Leaflets merely toothed. SUPINAE (p. 212) 
BB. Cymes not leafy or very little so, their leaves mostly reduced to bracts.. 
D. Leaves digitate or ternate. 
E. Basal leaves 3-foliolate. 
F. Plant glabrous or nearly so; leaves not tomentose. | FRIGIDAE (p. 214) 
FF. Plant slightly to densely villous or tomentose: leaves densely white to- 
mentose beneath. NIVEAE (p. 214) 
EE. Basal leaves 5—9-foliolate. 
G. Plants | dm. or less high, on high mountains. 
H. Stem glandular-puberulent; basal leaves 3—5-foliolate, puberulent, 
their leaflets 0.5—1 cm. long. BREVIFOLIAE (p. 214) 
HH. Stem silky-strigose; basal leaves 5—7-foliolate, densely silky on both 
sides and somewhat tomentose beneath, their leaflets |—2 cm. long. 
RUBICAULAE (p. 214) 
GG. Plants |—4 dm. high. 
I. Stipules 2—3 cm. long. GRACILAE (p. 213) 
II. Stipules 0.5—1.5 cm. long. 
J. Leaves somewhat tomentose beneath,’ and densely silky-villous with 
long hairs on both sides. CONCINNAE (p. 214) 
JJ. Leaves merely pubescent with short hairs on both sides, or also 
puberulent beneath. GRACILAE (p. 213) 
JJJ. Leaves silky-strigose on both sides, sometimes becoming glabrate. 
AUREAE (p. 214) 
GGG. Plants more than 4 dm. high. GRACILAE (p. 213) 
DD. Leaves odd-pinnate. 
K. Leaflets 3—7, more or less close together. : 
L. Leaves densely silky on both sides and somewhat tomentose beneath. 
RUBICAULAE (p. 214) 
LL. Leaves more or less strigose-silky but not at all tomentose. 
AUREAE (p. 214) 
LLL. Leaves merely puberulent. BREVIFOLIAE (p. 214) 
KK. Leaflets 7—27, often well separated. 
M. Leaves grayish or whitish, densely and softly villous. 
LEUCOPHYLLAE (p. 215) 
MM. Leaves green on both side or merely strigose. 
N. Petals white; bristles of the receptacle very long. 
ARENICOLAE (p. 213) 
NN. Petals yellow; bristles of the receptacle not abnormally long. 
MULTIJUGAE (p. 215) 
Subgenus SUPINAE—Annual or biennial or perennial, leafy. Flowers small, in 
many-flowered cymes; leaves of the inflorescence very little reduced. Petals Y—|l\% 
as long as the sepals, yellow or whitish, cuneate. Stamens often fewer than 10203 
‘thick and glandular below. 
A. Leaves all pinnate; leaflets 7—11: akenes gibbous. E. 
P. paradoxa Nutt. (Bushy 5-finger) 


