ROSACEAE (eOSB FAMILY) 257 



hirsute, its sepals equaling the bracts and the light yellow obovate petals: 

 stamens 15-20: achenes numerous, somewhat rugulose when mature. P. 

 norvegica. — ^Across the continent to the northward and south in the Rocky- 

 Mountains to New Mexico. 



7. Potentilla concinna Rich. Frankl. 1st. Joum. 739. 1823. Stems depressed- 

 spreading, somewhat tomentose: leaves densely white-tomentose beneath, 

 greenish but somewhat silky-villous above, 5-foliolate; leaflets obovate-cune- 

 ate, incisely toothed, 1-3 cm. long; stipules ovate-acuminate: flowers Solitary, 

 axillary or radical: sepals silky-villous or tomentose, longer than the bractlets 

 but surpassed by the Obeordate petals: carpels 15-20. P. hvmifusa. — ^Through- 

 out our range and to the northwest. 



8. Potentilla bicrenata Rydb. Bull. Torr. Bot. Club 23: 431. 1896. Much 

 like the preceding, the stem short, with spreading branches: leaves greenish 

 but silky above, densely white-tomentose beneath, digitately 5-foliolate ; leaf- 

 lets oblbng-cuneate, entire except at the truncately 3-5-toothed apex; stipules 

 as in the preceding: calyx silky; its sepals ovate-lanceolate; the bractlets 

 similar but smaller, exceeded by the ovate truncate petals. — Wyoming to 

 New Mexico. 



9. Potentilla glomerata A. Nels. Bull. Torr. Bot. Club 26: 480. 1899. 

 Stem stout, simple, erect, 4-8 dm. high, sometimes several from the large 

 woody root: leaves pinnately5-7-foUolate; the lower long-petioled; the upper- 

 most reduced and nearly sessile; leaflets oblong to narrowly obovate, cleft 

 into long, oblong, mostly obtuse teeth, green but finely pubescent ^above, 

 densely white-silky below; stipules oblong-ovate, entire or incised: flowers 

 congested-glomerulate: calyx silky; bractlets oblong, acute, shorter than the 

 sepals which equal the nearly orbicular petals. — Western Wyoming, Utah, and 

 IdahOk 



' 10. PotentiUaviridescensRydb.Monog. Pot. 1. C.69. Stems erect, branched 

 above, 4-7 dm. high: leaves about 7-foliolate, green but silky above, silky- 

 tomentulose but not white beneath; the lower long petioled; leaflets deeply 

 toothed, the teeth oblong; stipules ova'te, incisely cleft: flowers in an open 

 cyme, widely branched, corymbosely broad-topped: calyx and bractlets 

 Bilky, lanceolate, acuminate, scarcely shorter than the obeordate petals. 

 (P. Bakwi Rydb." Bull. Torr. Bot. Club 31: 560. 1904.)— Colorado to Canada. 



11. Potentilla diversifolia Lehm. Stirp. Pug. 2: 9. 1830. Stems erect, 

 often more than one from the crown, branched above, about 2 dm. high: 

 leaves 5-7-foliolate; the lower often approximately pinnate rather than digi- 

 tate; the upper reduced and sometimes trifoliolate; leaflets incisely toothed, 

 silvery silky-hirsute _ below, green but somewhat hirsute above; stipules 

 lance- or ovate-acuminate: cyme open, several-flowered: sepals softly hirsute, 

 lanceolate, longer than the similar bractlets but well exceeded by the obeor- 

 date petals. P.dissecta. [P. dissecia Pursh, Fl. Am. Sept. 355. 1814 (?).] — 

 Infrequent; Colorado to Cahfomia and north to the British boundary. 



12. Potentilla decurrens (Wats.) Rydb. Bull. Torr. Bot. Club 23: 396. 

 1896. Low and somewhat tufted^ about 1 dm. high: leaves subpinnate, 

 6-f oUolate, thick, with prominent vems beneath, sparsely villous and somewhat 

 glaucous; leaflets obovate, incisely cleft and more or less decurrent, the lower 

 pair reduced in size; stipules ovate, acute: cyme small, terminal on the scape- 

 like stems, very few-flowered: sepals silky-villous, lance-ovate, exceeding 

 the short obtuse bractlets by as much as they are exceeded by the obeordate 

 petals.: — Subalpine; northern Wyoming, westward and northward. 



13. Potentilla glaucophylla Lehm. Del. Sem. Hort. Bot. Hamb. 1836: 7. 

 Btems usually several, from a simple or branched scaly caudex, assurgent, 

 1-3 dm. high: leaves digitately 5-foUolate, nearly glabrous on both sides, 

 glaucous-green; leaflets silky on the margin, somewhat unequally serrate; 

 stipules ovate, acuminate, somewhat scaridus on the margins: cyme open, 

 several-flowered: bractlets small, about half as long as the lance-ovate merely 

 pubescent sepals: petals broadly obovate'j truncate or scarcely retuse at apex. 

 P.dissecta glaucophylla. — Very common in moist grassy valleys in the movm- 

 tains; throughout our range. 



