Flora of the Palouse Regiofi 97 



or elliptic, dentate, 2-3 ern. long, usually with smaller ones interspersed; 

 cauline leaves similar, but nearly sessile, with 1-3 leaflets or segments; 

 stipules ovate, toothed, 1-2 cm. long: flowers yellow, about 1 cm. broad, sev- 

 eral in a loose cyme: petals obovate, longer than the reflexed acute calyx- 

 lobes: fruiting head globose, 1.5 cm. long; akenes hispid; styles jointed and 

 twisted near the tip. Thatuna Hills, in moist places. 



G. ciliatum Pursh. Erect, from stout rootstocks, 30-50 cm. high, soft- 

 hairy throughout: radical leaves tufted, oblanceolate in outline, 10-15 cm. 

 long, pinnate with numerous leaflets, these cuneate, obovate, incisely cleft 

 into acute narrow lobes; cauline leaves 1 or 2, much reduced: flowers long- 

 peduncled, 3-5 in a cyme: calyx purplish, the linear bractlets exceeding the 

 triangular acute calyx-lobes: petals oblong, erect, yellowish or purplish, 

 shorter than the calyx: akenes with straight plumose tails, 2-3 cm. long. 

 Common on grass}- hillsides. 



158. POTENTILLA. 



Herbs or rarely shrubs: leaves alternate, pinnate or palmate, 

 with stipules: flowers perfect, solitary or in cymes: sepals 5, rarely 

 4, with 5, rarely 4, alternate bractlets: petals 5, seldom 4, rounded, 

 mostly yellow: stamens 20-50 or more, in two or three rows on 

 the calyx-tube: style small, terminal or nearly so, not elongating in 

 fruit, neither jointed nor plumose: carpels usually numerous; 

 ovules pendulous, anatropous: receptacle and akenes dry in fruit. 



Leaves palmately 5-7-foliolate. 



Leaves green on both sides. P. nuTTallii. 



Leaves white-woolly beneath. P. blaschkf.ana. 



Leaves pinnately 5-foliolate. P. rivalis. 



Leaves 3-foliolate. P. millegrana. 



P. nuttallii Lehm. Perennial, the whole plant sparsely hirsute: stems 

 tufted, erect, not branched below the inflorescence, 30-60 cm. high: leaves 

 palmately 5-7-foliolate, oblanceolate, coarsely and evenly toothed, green on 

 both sides, 5-8 cm. long; basal petioles long and slender, cauline ones short: 

 cymes many-flowered, loose: calyx about 1 cm. broad, the lobes longer than 

 the tube: bractlets about as long as the acuminate calyx-lobes: petals broad- 

 ly obovate, notched, equalling the calyx. Low ground, rather common. 



P. blaschkeana Turcz. Size and habit of the preceding, the stems finely 

 tomentose: leaflets densely white-tomentose beneath, cut half way to the mid- 

 ribs, into linear acute flat lobes: petals broadly obovate, with a large shallow 

 notch, twice as long as the sepals. Common on hillsides: forms with the 

 leaflets cut nearly to the midrib constitute P. ctenophora Rvd. 



P- rivalis Nutt. Annual or biennial: stems erect or ascending, branched 

 above, villous-pubescent, 30-40 cm. high: leaves pinnate, the lower 5-folio- 

 late, the cauline usually 3-foliolate; leaflets obovate, cuneate at base, incise- 

 ly toothed, 2-4 cm. long: cymes loose, leafy: flowers 4-6 mm. broad, on slen- 

 der pedicels, bractlets about as long as the ovate acute calyx-lobes: petals 

 yellow, shorter than the calyx-lobes: akenes smooth, gray. Banks of Snake 

 River. 



