64 SELECTED WESTBEN FLORA 



colored. Common in thick masses about the margins of ponds in Man. and 



5. Sask. 



4. P. pennsylv&nica, L. 



Stem erect, or reclining at the base, 6 in. to 2 ft. high; leaflets 5-9, white- 

 tomentose beneath, green above; flowers yellow in a somewhat open cyme. 

 Var. strigosa, Pursh. Stems lower, mostly reclining, white silky-tomentose 

 throughout; leaflets deeply pinnatifid, the margins of the lobes revolute; 

 cyme short and close. The variety more plentiful than the type. Man.- 

 Alta. 



6. P. Hippi^na, Lehm. 



Densely silvery-silky throughout, the upper surfaces of the leaves darker; 

 stem ascending, slender, branched above into a diffuse cyme; leaflets 5-11, 

 incisely toothed, getting smaller towards the stem; carpels 10-30. Com- 

 mon, Man.-Alta. 



6. P. effusa, Dougl. 



Tomentose throughout, and more or less covered with scattered hairs; 

 stem reclining, diffusely branched above; leaves pinnate, leaflets 5-11, 

 smaller leaflets alternating with the larger; carpels 10. Common in parts of 

 Manitoba and Eastern Saskatchewan, but not well differentiated from the 

 preceding species farther west. 



7. P. palfistris, (L.) Scop. 



Stem stout, ascending, glabrous; leaves pinnate, of 5-7 leaflets, serrate; 

 flowers purple in an open cyme. Bogs across the northern part of the prairie 

 region. 



8. P. fruticdsa, L. Sheubby Cinqtiefoil. 



Stem erect, shrubby, much branched, 1-2 ft. high; leaves pinnate, mar- 

 gins of leaflets revolute; flowers yellow. Sandy soil, common, Man.-Alta. 



9. P. tridentata, Ait. Thkee-toothed Cinquefoil. 



Stems low, 2-8 in. high, tufted, rather woody at the base; leaves of three 

 leaflets, wedge-shaped to oblong, smooth, coarsely 3-toothed at the apex; 

 flowers white in a few-flowered cyme. In wooded districts but not common, 

 Man.-Alta. 



10. ^ anserlna, L. Silver Weed. 



Widely spreading by slender runners; leaves all radical of 7-21 leaflets 

 with smaller leaflets between the larger; white silky-tomentose beneath, 

 usually green above; flowers large, yellow. Very common on low alkaline 

 ground, Man.-Alta. 



Var. concolor, Ser. Leaves canescent above as well as below. W- Alta. 



11. P. Wuttaim, Lehm. 



Stems several from a perennial root, ascending ; leaves 5-9-foliate, green 

 above, whitish beneath, deeply toothed ; flowers in a small compact cyme. 

 Low lying prairie, Man.-Alta. 



