Var. glabrafa (Lehm.) C. L. Hitchc. with calyx usually abundantly strigose to 

 hirsute and non-glandular, and leaves seldom glandular. 



10. Potentilla glandulosa Lindl. 



Stems strict, slender, 3-6 dm. high, viscid and glandular-hirsute, branching 

 above; basal leaves pinnate, with 5 to 9 leaflets, nearly glabrous above, sparingly 

 glandular-hirsute beneath; leaflets obovate, simply or doubly serrate, 1-3 cm. long; 

 stem leaves reduced; flowers in an open many-flowered cyme; hypanthium 

 glandular-hirsute; sepals ovate-lanceolate, acute to acuminate, 6-7 mm. long, 

 becoming 10 mm. long in fruit; bractlets linear-lanceolate, 4-5 mm. long; petals 

 obovate, yellow to cream-colored, about equaling the sepals; stamens 25 to 40; 

 style fusiform, somewhat roughened below. Drymocallis glandulosa (Lindl.) 

 Rydb. 



In wet places in N. M. (Colfax, Rio Arriba and San Miguel cos.) and Ariz. 

 (Coconino and Gila cos.), June-Sept.; Alas. e. to Sask. and Neb., s. to N. M., Ariz, 

 and Baja Calif. 



Our plants are usually referred to subsp. arizonica (Rydb.) Keck (P. Mac- 

 dougalii Tidestr., Drymocallis arizonica Rydb.), characterised by having pale- 

 yellow or cream-color petals. 



11. Potentilla arguta Pursh. var. convallaria (Rydb.) Th. Wolf. 



Perennial from a simple or branched caudex and usually rather short root- 

 stocks; stems mostly 4-8 dm. tall, commonly athocyanous, conspicuously pilose 

 or villous with multicellular, moniliform, glandular often brownish hairs; basal 

 leaves several, somewhat rosulate, pinnate; leaflets usually 5 to 9, ovate to 

 obovate or oblong to elliptic, mostly 1.5-4 cm. long, deeply serrate-dentate to 

 doubly serrate or shallowly incised, usually copiously short-hirsute and glandular- 

 puberulent or sometimes sparsely hairy or glabrate; flowers in a narrow tight 

 cyme, the lateral branches mostly numerous and almost strictly erect to form a 

 flat-topped inflorescence; calyx glandular, its oblong-lanceolate lobes mostly 6-8 

 mm. long and flared at anthesis but to about 12 mm. long and erect in fruit; 

 hypanthium saucer-shaped; petals pale-yellow to whitish, oblong-obovate to 

 obovate, somewhat shorter to longer than the sepals; stamens about 25; styles 

 slenderly fusiform, inserted below mid-length of ovary; achenes 1-1.3 mm. long, 

 slightly beaked. Incl. subsp. convallaria (Rydb.) Keck. 



Wet meadows, valleys and prairies, in Okla. (Waterfall), N. M. {Kearney & 

 Peebles) and Ariz. (Apache and Navajo cos.), May-July; Que. to Alas., s. 

 to D.C., Ind., III., Mo., Okla., N. M. and Ariz. 



12. Potentaia plattensis T. & G. 



Low perennial; stems 1-2 (-3) dm. high, usually several, erect to ascending 

 or prostrate, glabrate to villous; leaves mostly basal, pinnately compound; leaflets 

 7 to 17, obovate-oblong, incised to near the midrib into linear or narrowly 

 oblong lobes, 6-8 mm. long, glabrous to appressed-strigose; stem leaves reduced, 

 the uppermost only 3-cleft; stipules large for size of plant, about 1 cm. long, 

 broadly ovate, subentire and often obtuse; cymes few- to several-flowered; calyx 

 strigose, the sepals 4-5 mm. long; bractlets narrower and definitely shorter than 

 sepals; petals 5-7 mm. long, yellow with an orange spot often present near base; 

 stamens about 20; anthers about 0.8 mm. long; styles long and filiform; achenes 

 glabrous. 



In wet grassy meadows in N. M. (Taos Co.) and Ariz. (Apache and Coconino 

 COS.), July-Aug.; Sask. and Alta., s. to N. M., Ariz, and Nev. 



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