
Rosaceae 207 
plant not alpine; leaves 3—5-lobed half way to the mid-vein or shallower; 
flowers in corymbs. PuysocarPus (p. 208) 
BB. Ejther the leaves compound, or else the plants vines. 
I. Leaves compound; leaflets entire. 
J. Leaves 2-pinnate; leaflets many; petals white; twigs stellate-tomentose. 
CHAMAEBATIARIA (p. 210) 
JJ. Leaves |-pinnate; leaflets 5—-7; petals yellow; twigs silky-villous. 
DaSIPHORA (p. 216) 
II. Either leaves simple or leaflets not entire. 
K. Fruit of drupelets usually united to form a pulpy berry; shrubs or herbs, some 
trailing, smooth or prickly. Rusus (p. 219) 
KK. Fruit a globular or flask-shaped fleshy receptacle containing a few bony 
akenes; shrubs, none trailing, prickly. Rosa (p. 220) 
AA. — Herbs. 
L. Leaves simple, 4—12 mm. long, deeply 3-lobed, the lobes 2—4-cleft; plant 
2.5—20 cm. high; petals none. ALCHEMILLA (p. 217) 
LL. Not as above in all characters; petals present in most. 
M. Leaves ternately many times compound. ARUNCUS (p. 209) 
MM. Leaves not ternate or if so leaflets only 3. 
N. Leaves palmately- or ternately-veined or -lobed or -compound. 
O. Fruit of a few fleshy drupelets; vines, alpine; leaves scattered, alternate, 
distant. RusBus (p. 219) 
, OO. Fruit of dry akenes; not vines with scattered distant leaves. 
P. Leaves all 3-foliolate. 
Q. Flowers white; plants with runners which give rise to new plants 
at the joints; leaves all basal. FRAGARIA (p. 216) 
QQ. Flowers yellow; plants without runners; leaves usually not all 
basal. 
R. Petals oblanceolate; stamens 5; style lateral; leaflets 6—25 mm. 
long, 3—5-toothed at the apex. SIBBALDIA (p. 216) 
RR. Petals wider ; stamens 20; style terminal or nearly sO; leaflets 
often longer, usually with more teeth. POTENTILLA (p. 211) 
PP. Leaves or some of them not 3-foliolate. © PoTENTILLA (p. 211) 
NN. At least the basal leaves pinnately-veined or -lobed or -compound. 
S. Leaves simple, coarsely toothed; alpine caespitose plant; petals 8—9. 
Dryas (p. 218) 
SS. Leaves either compound or deeply dissected; petals not 8—9. 
T. Calyx surrounded by a dense border of hooked prickles. 
AGRIMONIA (p. 218) 
TT. Calyx not surrounded by prickles. 
U. Flowers in a dense spike; petals none; calyx-segments 4; stamens 
2-—12; calyx constricted over the fruit. . SANGUISORBA (p. 218) 
UU. Flowers not in spikes; petals present; calyx-segments rarely 4; 
stamens often more; calyx not constricted over the fruit. 
V. Style terminal. 
W. Style jointed to the ovary, deciduous; leaves pinnately com- 
pound. . 
X. Stamens very near the base of the receptacle-cup on a ring- 
like thickening. POTENTILLA (p. 211) 
XX. Stamens well up on the receptacle-cup, ring-like thicken- 
ing none. HorKELIiA (p. 210) 

