EOSACE^ 63 



heart-shaped base; otherwise the plant is smaller and more hairy. Moist 

 prairie or mountain woods, local, Sask. and Alta. 



3. G. triflorum, Pursh. Thhee-flowebed Avens. 



Low, aoft-hairy; root leaves interruptedly pinnate, leaflets numerous ; 

 flowers usually 3, on » long peduncle; flowers reddish purple, the bracts on 

 the calyx longer than the lobes of the calyx ; styles persistent, forming long 

 feathery tails to the aoheues. Dry prairie, common, Man.-Alta. 



I 



4. DRYAS. Mountain Avens. 



Calyx 8-9-lobed, persistent, without bracts; petals 8-9, larger 

 than the caljrx lobes; stamens numerous; carpels numerous on a 

 dry receptacle; style terminal, persistent, elongated into a feathery 

 tail in fruit. Low, tufted, shrubby plants with simple, petioled, 

 stipulate leaves, and rather large white or yellow flowers. 



1. D. octopStala, L. White Mountain Avens. 



Stem prostrate and woody at the base; leaves ovate, coarsely crenate, 

 glabrous above, and densely white-tomentose beneath; stipules linear; 

 flowers white, about 1 in. across. Rocky Mts. 



2. D. Drummdndii, Richards. Dbummond's Mountain Avens. 

 Similar to preceding, but the leaves rather dentate than crenate; the scape 



pubescent; flowers yellow, with glandular-pubescent sepals. Rocky Mts. 



5. POTENTILLA. Cinquefoil. 



Calyx flat, deeply 5-oleft, but appearing 10-oleft because of 5 

 bracts alternating with the. lobes of the calyx; petals 5, roundish; 

 stamens numerous ; pistils numerous, forming achenes collected on a 

 dry receptacle. Herbs — or in one case a shrub — with compound 

 leaves and large solitary or oymose flowers. 



1. P. arguta, Pursh. 



Stem erect, stout, 1-2 ft. high, hairy and rather clammy towards the top ; 

 leaflets 7-11, downy beneath; stamens about 30; flowers large, white, in a 

 close cyme. Open prairies, and thickets, Man.-N. Alta. 



2. P. monspeliensis, L. 



Stout, erect, coarse, hairy, 6 in. to 2 ft. high; leaves 3-foliate, leaflets 

 obovate, variously toothed; flowers yellow, rathei; small, in a close leafy 

 cyme. (P. norvegica, L.) Common in cultivated ground and waste places 

 across the prairies. 



3. P. rivdlis, Nutt. ; var. millegr&na, (Engelm.) Wats. 



Resembling the preceding, but more slender and branched, either erect or 

 ascending, and the cyme less leafy; petals minute; achenes small, light- 



