I40 ROSACEAE. 



Potentilla monspeliensis L. Annual or biennial, stout, leafy, erect, 30-80 

 cm. high, hairy; leaves 3-foliolate, or the lowest sometimes 5-foliolate, green; 

 leaflets obovate to oblanceolate, serrate, 3-10 cm. long; cyme rather dense, 

 leafy; calyx hairy; petals pale yellow, obovate; stamens usually 20; akenes 

 glabrous, rough. In meadows, Marshall, Spokane County. 



Potentilla biennis Greene. Similar to P. rivalis but leaves all 3-foliolate, 

 usually somewhat glandular; leaflets broadly cuneate-obovate; inflorescence 

 somewhat elongate; akenes white, smooth. In dry ground, common in the 

 warmer valleys. 



Potentilla permollis Rydb. Very similar to P. nultallii but densely hirsute- 

 pubescent throughout with nearly white soft hairs; inflorescence rather dense; 

 teeth of the leaflets rather long, lanceolate. In moist meadows at Endicott, 

 Elmer. 



Potentilla blaschkeana Turcz. Perennial; stems tufted, erect, 60-80 cm. 

 high, finely tomentose; leaflets densely white-tomentose beneath, cut half way 

 to the midribs into linear acute flat lobes; petals broadly obovate, with a large 

 shallow notch, twice as long as the sepals. Common on hillsides. Some of 

 our forms have been considered distinct and have been called P. glomerata 

 A. Nelson and P. longiloba Rydb. 



Potentilla nuttallii Lehm. Perennial, with a short rootstock; stem 60-80 

 cm. high, branched above, sparingly hirsute; basal leaves digitate, usually 

 7-foliolate, prominently veined and sparingly hirsute, not at all tomentose 

 beneath, green; petioles pubescent with appressed hairs; cauline leaves smaller 

 and short-petioled; cymes many-flowered; bractlets linear to lanceolate, gener- 

 ally shorter than the ovate-lanceolate, long-acuminate sepals which are 5-7 

 mm. long; petals yellow, obovate, emarginate, 6-8 mm. long. Around Lake 

 Waha, Nez Perces County, Idaho. 



Potentilla rectiformis Rydb. Perennial, the whole plant sparsely hirsute; 

 stems tufted, erect, not branched below the inflorescence, 30-60 cm. high; 

 leaves palmately S-7-foliolate, oblanceolate, coarsely and evenly toothed, 

 green on both sides, S-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 

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



199. IVESIA. 



Low herbs with pinnate leaves with numerous small palmately 

 lobed crowded leaflets ; flowers yellow, in cymes ; calyx bell- 

 shaped, S-lobed, with 5 alternate bractlets; stamens 5; filaments 

 slender, subulate or filiform ; carpels few or one on a small villous 

 receptacle; styles filiform, subterminal. 



Ivesia gordoni (Hook.) T. & G. Viscid puberulent or nearly glabrous; 

 stems 5-20 cm. high, from a stout caudex; leaflets 10-20 pairs, approximate, 

 each divided into 3-5 narrow segments; cauline leaves small, pinnatifid; cyme 

 dense; petals scarcely exceeding the sepals, yellow. On high ridges in the 

 Blue Mountains, rare. 



200. SIBBALDIA. 



Depressed alpine plants somewhat woody with alternate tri- 

 foliolate leaves; flowers in cymes on nearly leafless peduncles; 

 calyx persistent, slightly concave, 5-lobed, with 5 bracts; petals 



