214 Rosaceae 
JJ. Leaflets appressed, pubescent on both sides or glabrate above. E. 
P. rectiformis Rydb. 
Ii. Leaflets dissected less than half way to the mid-vein. 
K. Leaflets strongly ribbed, rather firm; petals 6—8 mm. long. E. 
(P. grosseserrata. ) 
P. nuttallii Lehm. 
KK. Leaflets not strongly ribbed, thin; petals 10-12 mm. long. U. 
P. macropetala Rydb. 
Subgenus LONGIPEDUNCULATAE—Perennial. Leaves palmately 3—5- 
foliolate; leaflets oblanceolate, slightly silky and green above, densely tomentose beneath, 
dissected half-way to the mid-vein into oblong-lanceolate divergent segments. Flowers 
about 2 cm. in diameter, on long pedicels. W. 
P. longipedunculata Rydb. 
Subgenus AUREAF—Perennial; stems rather simple, ascending or erect, few- 
flowered, usually less than 3 dm. high. Leaves rather thin, 5—7-foliolate, usually digi- 
tate, rarely pinnate with leaflets close together. Pubescence silky-strigose or hirsute, not 
at all tomentose. 
A. Leaflets silky-strigose beneath even when mature; stipules acuminate; calyx-tube 
7—10 mm. wide in fruit; calyx-segments acute, 3—5 mm. long. C. E. (P. dis- 
secta.) P, diversifolia, Lehm. . 
AA. Leaflets silky-strigose when young but glabrate when mature; stipules acute; calyx- 
tube 5—-7 mm. wide in fruit; calyx-segments acuminate, 5-7 mm. long. C. E. ( 
dissecta glaucophylla. ) P. glaucophylla Lehm. 
Subgenus CONCINNAE—Perennial. Stems generally low, spreading, at last 
prostrate. Leaves digitately 5—-7-foliolate, silky above, more or less tomentose or white- 
silky beneath. Cymes few-flowered. E. 
P. fastigiata Nutt. 
Subgenus NIVEAE—DMostly low and tufted (not over 3 dm. in ours). Leaves 
digitately 3-foliolate, more or less tomentose beneath. 
A. Leaflets 2—4 cm. long; flowers 2—3 cm. wide; calyx-tube 15-20 mm. wide; 
bractlets elliptic to widely ovate or oval. W. C. 
FP, villosa Pall. 
AA. Leaflets 1—1.5 cm. long; flowers 1.5—-2 cm. wide; calyx-tube 7—9 mm. wide; 
bractlets lanceolate. C. E. F. uniflora, Ledeb. 
Subgenus FRIGIDAE—Low, often tufted. Leaves digitately 3-foliolate, not at 
all tomentose, coarsely toothed. in 
A. Stems less than | dm. high; stem-leaves few and reduced. E. 
P. trina Nels. 
AA. Stems 2—3 dm. high; stem-leaves not few, not or hardly reduced. W. C. E. 
P. flabellifolia Hook. 
Subgenus BREVIFOLIAE—Low, alpine. Stems erect or ascending, not over | 
dm. high (ours), few-leaved. Leaves pinnate or ternate; leaflets 35, nearly glabrous. 
P. brevifolia, Nutt. 
Subgenus RUBICAULAE—More or less caespitose. Stems decumbent (not ours) 
or ascending or erect, short, subscapose, few-leaved. Leaves pinnate or somewhat digi- 
tate; leaflets 5-7, near together, more or less tomentose beneath. E. (P. filicaulis. ) 
P. hippiana Lehm. ; 



