360 coxtributioj^s from the national herbarium. 



Plants without runners; flowers in cy^es. 



Petals purple 17. P. palustris. 



Petals yellow. 



Leaflets almost equally white-hairy on both surfaces . ... 3. P. hippiana. 

 Leaflets green on the upper surface. 

 Leaflets toothed; style longer than the mature achene, slender. 



4. P. pulcherrima. 

 Leaflets deeply lobed ; style not longer than the achene, thickened ut 

 the base. 



Leaflets 7 to 15, grayish beneath 6. P. pennsylvanica. 



Leaflets usually 5, white beneath 6. P. platyloba. 



Leaves digitate, the leaflets all attached at the end of the petiole. 

 Leaflets not at all woolly beneath, the pubescence of straight hairs. 



Leaflets nearly glabrous 7. P. glaucophylla. 



Leaflets densely hairy on one or both surfaces 8. P. nuttallii. 



Leaflets with woolly matted hairs on the lower surface. 

 Leaflets 5, 1 to 2 cm. long; plants 10 to 15 cm. high. 



10. P. quinquefolia. 

 Leaflets more than 5 in most of the leaves, usually more than 3 cm. long; 



plants commonly 20 to 60 cm. high. 

 Leaflets divided more than halfway to the margin into narrow lobes. 



11. P. blaschkeana. 

 Leaflets toothed or lobed less than halfway to the margin. 



Leaflets shallowly t<-othed, with rounded or obtuse teeth. 



12. P. filipes. 

 Leaflets deeply tcothed, with lanceolate or oblong, often acutish teeth. 



Petioles with loosely spreading hairs 13. P. gracilis. 



Petioles with appressed or ascending hairs. 



Inflorescence dense, leafy; leaflets white beneath . 14. P. dichroa. 



Inflorescence loose and open, not leafy; leaflets grayish green 



beneath 15. P. viridescens. 



1. Potentilla fruticosa L. Bush cinquefoil. Common at nearly all altitudes, 

 chiefly on open slopes or in meadows; abundant in low places on prairie. Alaska to 

 Calif., N. Mex., N. J., and Lab.; also in Eur. and Asia. (Dasiphora fruticosa Rydb.) — 

 Densely branched shrub, 0.3 to 1 meter high, with shredded bark; leaves pinnate, 

 the leaflets 3 to 7, silky-hairy, 1 to 2 cm. long, entire; flowers solitary or in small 

 clusters, 1.5 to 3 cm. broad. 



A conspicuous shrub when covered with the bright yellow flowers. Above timber 

 line the plants are sometimes prostrate. One plant was noticed which had creamy 

 white flowers. 



2. Potentilla monspeliensis L. Frequent at low and middle altitudes, in meadows, 

 woods, or thickets, or on slopes, sometimes in sphagnum bops. Widely distributed 

 in N. Amer., Eur., and Asia. — Plants biennial, stout, 20 to 50 cm. hiph, very leafy, 

 loosely hairy; leaflets 3 to 7 cm. long, toothed; petals slightly shorter than the sepals. 



3. Potentilla hippiana Lehm. Frequent on the east slope at low altitudes, on 

 prairie or open hillsides. Alta. and Sask. to N. Mex. and Ariz. — Stems stout, 20 to 

 50 cm. high; leaflets 7 to 11, 2 to 5 cm. long, coarsely toothed; petals 6 to 8 mm. long. 



4. Potentilla pulcherrima Lehm. Occasional on the east slope at middle altitudes 

 or above timber line, on open hillsides. Alta. and Sask. to N. Mex. and Utah. — 

 Stems 25 to 50 cm. high, hairy; leaflets 5 or 7, 1.5 to 6 cm. long, white-woolly beneath, 

 the lower leaflets smaller than the others; petals 5 to 7 mm. long. 



