1X. Potentilla L. 
Anmal or perennial herbs with rootstocks. Leaves palmately com= 
pound, stipules present. Flowers mostly in open cymose panicles, few or 
manye Calyx 5-parted, the tube mostly hemispherical, the sepals alternating 
with sepal-like appendages. Petals 5, mostly yellow, rarely dark-purple, ©. 
deciduous, obovate or obcordate. Stamens about 20 in 3 series, the filemer 
filiform or subulate. Style attached near the apex of the ovary, deciduous. ‘4 
Fruit a cluster of achenes. re 
O Leaves palmately trifoliolate 
2 Achenes distinctly wrinkled; petals 5 mm. long |. Pe. monspelien 3 
~ Achenes smooth 
4 Petals 1.5 mm. long or wanting; snnuals; leaves P. rivalis a. 
@ chicfly cauline ; 2. . 
4 er al mne long; perennials. leaves chiefly P. flabellifo 7 
Dasa 
é etere 3, 
o Leaves palmately 5-9 foliolate ae 
R, Leaves thinly silky with soft fine hairs when 
q young, nearly or quite glabrous at maturity, 
b and somewhat glaucous; petals 5-7 mm. long 4. P. diversifolig 
«: Leaves never glabrous or glaucous, in some 
“, ys species white-tomentose beneath, or if green, 
o‘\hirsute with stiffish hairs 
Leaves white-tomentose beneath with short 
1 ene hairs, the veins hirsute, the upper 
surfaces greene 
Leexres—5—-felLiclate; Betals 2e5 mme long s. P. argentea 
Leaves-7-G=feliclate; Betals 7-12 mn. long 6. Pe gracilis 
alae 
4 Leaves green on both surfaces, more or less 
ra hirsute with stiffish hairs; petals obcor- 
8< date, 12-14 mn. broad 7, P. Muttallii 
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