ROSE FAMILY 413 



carpa Rydb. River valleys: 111. Man. Wash. Calif. N.M. Plain Sub- 

 mont. My-S. 



4. P. biennis Greene. Annual or biennial; stems often several from the 

 root, 3-5 dm. high, finely and rather densely pubescent, often tinged with red or 

 purple; leaves all ternate; leaflets broadly obovate, coarsely crenate, 2-4 cm. 

 long; flowers small, about 5 mm. in diameter; bractlets ovate-lanceolate or oblong, 

 acute, a little shorter than the ovate acute sepals; petals yellow, obovate-cuneate, 

 much shorter than the sepals; stamens about 10; ripe achenes whitish, smooth. 

 Waste places: B.C. Sask. Colo. Ariz. L. Calif. PlainSubmont. My-S. 



6. P. Kelseyi Rydb. Biennial; stem stout, 6-7 dm. high, glandular-villous; 

 leaves ternate; leaflets obovate or cuneate-obovate, 3-5 cm. long, incised-crenate, 

 sparingly pubescent on both sides; inflorescence rather short and compact; 

 hypanthium 5 mm. wide; bractlets and sepals subequal, 5 mm. long, linear- 

 lanceolate; petals obcordate, apparently white, about half as long as the sepals. 

 Perhaps a hybrid of P. biennis and P. monspeliensis. Waste places: Mont. 

 Submont. Je. 



6. P. monspeliensis L. Stems stout and very leafy, 3-8 dm. high, often 

 several from the annual or biennial root, hirsute; leaves digitately 3-foliolate, or 

 in luxuriant forms the lower sometimes digitately or pinnately 5-foliolate; 

 leaflets usually obovate, 3-10 cm. long, serrate; flowers about 1 cm. in diameter; 

 bractlets and sepals oblong-lanceolate, acute, nearly of the same length; petals 

 light yellow, obovate, or cuneate, truncate, nearly equalling the sepals; stamens 

 generally 20, sometimes only 15; achenes usually rugulose when ripe. P. nor- 

 vegica hirsuta Michx. Rich soil and waste places: Lab. D.C. Kans. Mex. 

 Calif. Alaska; Eurasia. Plain Submont. My-S. 



7. P. pentandra Engelm. Annual; stems stout, very leafy, 3-7 dm. high, 

 finely hirsute and much branched above; leaflets 2-10 cm. long, oblong to ob- 

 lanceolate or cuneate, deeply serrate, pubescent on both sides; flowers less than 

 5 mm. in diameter; bractlets oblong, acute, about 3 mm. long, nearly as long as 

 the ovate acute sepals; petals pale yellow, obovate, scarcely hah as long as the 

 sepals; achenes smooth, brownish. Bottom-land: Mo. Ark. -Sask. Alta. 

 Neb. Plain. Je-Au. 



8. P. brunnescens Rydb. Stem 4-5 dm. high, with spreading pubescence; 

 petioles villous with spreading hairs; leaflets 4-7 cm. long, broadly oblanceolate 

 in outline; segments linear, obtuse; hypanthium and calyx villous-strigose; bract- 

 lets linear, obtuse, about half as long as the ovate-lanceolate acute sepals; petals 

 yellow, 5-6 mm. long, obovate; stamens 20. Mountains: Colo. Mont. Sub- 

 mont. My-Au. 



9. P. Nuttallii Lehm. Stem 6-8 dm. high, stout, sparingly hirsute; basal 

 leaves digitate, sparingly hirsute, not at all tomentose beneath; petioles with 

 appressed hairs; leaflets 5-10 cm. long, oblanceolate, 'toothed or divided nearly 

 halfway to the midrib; hypanthium hirsute, in fruit about 1 cm. in diameter; 

 bractlets linear to lanceolate, generally shorter than the ovate-lanceolate sepals; 

 petals yellow, obovate, emarginate, 6-8 mm. long. Mountain valleys: Sask. 

 Colo. Ore. B.C. Plain Mont. My-Au. 



10. P. juncunda A. Nels. Stem slightly appressed-pubescent, slender, 

 4-7 dm. high; basal leaflets 4-7 cm. long, obovate-oblanceolate, green on both 

 sides, nearly glabrous above, slightly appressed-silky beneath, coarsely serrate; 

 hypanthium softly pubescent; bractlets linear-lanceolate, a little shorter than 

 the broadly lanceolate sepals; petals broadly obcordate, 8-10 mm. long. Moun- 

 tains: Mont. -Colo. Utah 'Ida. Submont. Mont. Je-Au. 



11. P. rectiformis Rydb. Stem 6-10 dm. high, densely strigose; leaflets 

 oblanceolate or spatulate, 4-6 cm. long, coarsely cut-toothed with lanceolate 

 teeth curved forward, appressed-pubescent on both sides or glabrate above; 

 hypanthium strigose; bractlets linear-lanceolate, 5-7 mm. long, about equalling 

 the ovate-lanceolate acuminate sepals; petals obcordate, 6-7 mm. long. Valleys: 

 Wash. -Ida. -Mont. Plain Submont. Je-Jl. 





