176 ROSACEA. 



POTENTIT,LA. 



conspicuously ciliate ; bractlets linear-lanceolate, 3-4 lines long; petals 

 broadly obovate or nearly orbicular, 6 lines Ions; or more, bright yellow : 

 achenes not known. In wet meadows on the Siskiyou Mountains near 

 Ashland Butte, Oregon. 



P. fissa Nutt. 1. c Viscidly pubescent: stems erect, branching, leafy, 

 8-10 inches high : leaves 9-11-foliolate on short petioles; leaflets unequal, 

 roundish or oval, deeply incised or incisely toothed ; cymes narrow, few- 

 flowered ; sepals ovate-lanceolate, long-acuminate; bractlets much smaller, 

 often toothed ; petals bright yellow, large, very concave, much exceeding 

 the sepals. Idaho to the Rocky Mountains. 



P. glandulosa Lindl. Bot. Reg. xix, t, 1583. Stems erect, slender, 

 branched above, villous-pubescent, viscid toward the summit: radical 

 leaves pinnately 5-9-foliolate : leaflets ovate or roundish, those of the nearly 

 sessile caulme leaves obovate or oblong, all deeply and usually doubly ser- 

 rate-toothed and often incised : branches of the cyme elongated and rather 

 loosely-flowered; sepals ovate, acute, as long as the broadly oval yellow 

 petals. Eastern Washington and Brit. Columbia to South Dakota and 

 New Mexico. 



P. Wrangelliana Fish. & All. Anirn. Bot. Ind. Sem. Stems erect, 1-2 

 feet high, glandular-pubescent: leaves pinnately 5-9-foliolate; leaflets ovate 

 or rhombic-ovate, coarsely and doubly serrate: cyme dichotomously 

 branched, with a short-pedicelled flower in the forks, lax, leafy- bracted; 

 sepals oval, abruptly contracted into a small almost mucronate point; 

 petals pale yellow, obovoid, scarcely equalling the calyx ; stamens 25, in 

 one row on the margin of the thickened disk. Valleys of the coast range, 

 Washington to California. 



P. reflexa Greene Pitt, iii, 19. Stems erect or spreading, 1-2 feet- 

 high, rather slender; minutely villous-hirsute throughout and somewhat 

 glandular: radical leaves 3-6 inches long, 5-9-foliolate; stipules entire; 

 leaflets orbicular to oblong, coarsely and doubly serrate, an inch long or 

 less: cymes open -paniculate ; pedicels slender, often elongated: sepals 

 narrowy triangular, acute, 3-4 lines long; the linear-lanceolate bractlets 

 about half as long ; petals obovate, 3-4 lines long, about equalling the 

 sepals, yellow. Common on dry open hills and plains, Washington to 

 California. 



P. rhomboidea Rydberg Bull. Torr. Club xxiii, 248. P. glandulosa 

 yar. Nevadcnsw Watson. Sparingly villous to nearly glabrous ; slightly 

 if at all glandular: stems slender, 4-8 inches high, often solitary : radical 

 leaves, 5-7-foliolate, short petioled: stipules ovate, subentire; leaflets 

 rhombic-ovate, mostly acute, serrate with acute teeth, 4-8 lines long: 

 cymes open, few-flowered pedicels stout and rather rigid ; calyx sparingly 

 hairy, the oblong acute lobes 2-4 lines long; bractlets linear-lanceolate, 

 l-2 1ir.es long, petals yellow, 12 lines long obovate, tardily deciduous: 

 stamens 15-25; styles nearly basal, filiform. On cliffs in the high 

 mountains, Washington to California and Nevada. 



* * Style terminal: disk not thickened; flowers small yellow, 

 leaves pinnate or ternate. 



+■ Annuals or biennials ; .leaflets incisely serrate, not white tomen 

 tose. 



P. Monspeliensis L. Sp. 499. P. Norvegica L. Hirsute: stems stout, 

 erect, L-3 feet high, leafy, at length dichotomously branched above: 

 leaves trifoliolate, mostly short petioled; stipules large, ovate, coarsely 

 incised or entire; leaflets obovate or oblong-lanceolate, 1-3 inches long : 

 eynie leafy and rather loose; calyx large, becoming 3-5 lines long, the 

 bractlets nearly equalling or exceeding the sepals; petals obovate, often 

 emarginate, not longer than the sepals ; stamens 15-20, in 2 rows ; recep- 



