t82 KOSACKAE (rose FAMILY) 



* * Style terminal ; flowers small ; petals yellow. 



■*- Annual or biennial; leaflets incisely serrate^ not white-tomentose , iameni 



6-20. 



2. P. monspeli^nsis L. Stout, erect, hirsute, 2-9 dm. high ; leaves ^-folio- 

 late ; leaflets obovate to oblanceolate, those of the uppermost leaves toothed 

 nearly the whole length ; cyme rather close, leafy ; calyx large ; stamens 15-20. 

 — Open soil, Nfd. to Alaska, s. to D. C, Mo., Kan., and N. Max. May-Aug. 

 (E. Asia.) 



Var. norvegica (L.) Rydb. Less hirsute; leaflets more narrowly oblong, 

 those of the uppermost leaves mostly 3-5-toothed near the end; inflorescence 

 looser. (P. norvegica L.) — Similar situations, e. Que. to n. N. E., L. Superior, 

 and north westw.; occasional on ballast southw. (P^urasia.) 



Var. Iabrad6rica (Lehm.) Fernald. Low (1—3 dm. high, in exposed situations 

 sicaulescent); stem glabrous or sparingly silky-villous ; leaves smoothish. — Lab. 

 to the alpine regions of the White Mts., N. H. 



3. P. rivalis Nutt. More slender and branched, softly villous; leaves pin- 

 nate, with two pairs of closely approximate leaflets, or a single pair and the 

 terminal leaflet S-parted; leaflets cuneate-obovate or -oblong ; cyme loose, often 

 diffuse, less leafy; calyx small; petals minute; stamens 10-20 (rarely 5). — 

 Seh. to Mo., N. Mex., and westw. May-Aug. 



Var. millegrana (Engelm.) Wats. Leaves all 8-foliolate ; lateral leaflets not 

 divided ; stems erect, or weak and ascending ; achenes often small and light- 

 colored. (P. leucocarpa Rydb.) — Minn, to Mo., westw. and south westw. 



* Var. pentandra (P]ngelm.) Wats. Leaves digitately o-foliolate, the lateral 

 '.eaflets of the lower leaves parted nearly to the base ; stamens 5, opposite the 

 sepals. (P. pentandra Engelm.) — Minn, to Mo. and Ark. 



4. P. parad6xa Nutt. Stems decumbent at base or erect, often stout, leafy, 

 subvillous ; leaflets pinnately 5-11, obovate or oblong ; cyme loose, leafy ; stamens 

 20; achenes strongly gibbous on the ventral side. (P. supina of auth., not 

 L.) — Prairies and river banks, w. N. Y. and Ont. to 111., Mo., N. Mex., and 

 B. C. June-Aug. (Asia.) 



5. P. Nicolletii (Wats.) Sheldon. Slender; leaflets mostly 3 ; inflorescence 

 much elongated, leafy, falsely racemose. (P. supina, var. Wats.) — Sandy soil. 

 Mo. (Bush) to N. Dak. 



■*- t- Herbaceous perennials, more or less white-tomentose ; leaflets incisely 

 pinnatifid ; bractlets and sepals nearly equal ; stamens 20-25. 



6. P. pennsylvanica L. Stems erect or decumbent at base, 2-6 dm. high ; 

 leaflets 5-9, white-tomentose beneath, .short-pubescent and greener above, ob- 

 long, obtuse, the linear .segments .slightly or not at all revoiute ; cyme fastigi- 

 ate but rather open. (P. litoralis Rydb.) — Coast of N. H., Me., and the lower 

 St. Lawrence, L. Superior, and westw. June-Aug. 



§ 2. Styles filiform, not glandular at base ; inflorescence cymose. 



•^ Style terminal; achenes glabrous; stamens 20 ; herbaceous perennials, with 



rather large ytdlow petals. 



•*- Leaves palmate. 



•V+ Flowers in loose leafy cymes. 



7. P. arg6ntea L. (Silvery C.) Stems ascending or depressed, 1-5 dm. 

 long, paniculately branched at the summit, many-flowered, white-woolly; leaf- 

 lets 5, wedge-oblong, almost pinnatifid, entire toward the base, with revoiute 

 margins, green above, white with silvery wool beneatli ; calyx white-tomen- 

 tose. — Dry barren fields, etc., N. S. to Dak. and southw. to 1). C. June- 

 Sept. (Eu.) 



8. P. iNTKKMKDiv L. Coanscr ; the stout upright ^rrt///.s7/-^^rw^?*^?</os^^ s^^ws 

 3-7 dm. high ; leaflets .3-5, the lateral and often the terminal deeply cleft, 

 oblanceolate to narrowly obovate, coarsely dentate, green above, grayish-villous 

 ind tomentulose beneath; cyme somewhat leafy and diffuse; calyx villous- 



