ROSACES. 69 



-- -- Style arising from the side of the carpel. 



14. P. frutieo'sa, L. (SHRUBBY C.) Stem erect, shrubby, 

 1-3 feet high, much branched. Leaves pinnate, of 5-7 leaf- 

 lets, closely crowded, entire, silky, especially beneath. 

 Flowers numerous, large, yellow, terminating the branches. 



15. P. tridenta'ta, Ait., (THREE-TOOTHED C.) is common 

 eastward towards the sea-coast. Stem 4-6 inches high. 

 Leaves rigid, palmate, of 3 wedge-shaped leaflets, 3-toothed 

 at the apex. Petals white. 



16. P. palustris, Scop. (MARSH FIVE-FINGER.) Stem 

 ascending. Leaves pinnate, of 5-7 lanceolate, crowded, 

 deeply serrate leaflets, whitish beneath. Calyx an inch 

 broad, dark purple inside. Petals purple. B.ogs. 



* * * Styles filiform, lateral. Peduncles axillary, solitary, 1-flowered. 



17. P. Anseri'na, L. (SILVER -WEED.) A low plant, 

 creeping with slender runners. Leaves all radical, interrupt- 

 edly pinnate ; leaflets 9-19, serrate, green above, silvery-silky 

 beneath. Flowers solitary, on long scape-like peduncles, bright 

 yellow. Biver and lake margins. 



18. P. Canaden'siS, L. (CANADA C.) Stem prostrate or 

 ascending, silky-hairy. Leaves palmate, of 5 leaflets, the 

 latter serrate towards the apex. Flowers solitary. Petals 

 yellow, larger than the sepals. Dry soil. 



10. 4 II \ U I ICIIOIMIS, I Jmmv. 



C. ereeta, Burige. Stem slender, 2-12 inches high, 

 branching above. Radical leaves many-cleft, forming a 

 rosette; cauline ones 3-5-cleft. N.W. prairies. 



11. Fit .VGA/ IMA, Tourn. STRAWBERRY. 



1. F. Virginia' na, Ehrhart. Achenes deeply imbedded in 

 pits on the surface of the fleshy receptacle ; calyx erect 

 after flowering. Leaflets firm. 



2. F. ves'ea, L. Achenes not sunk in pits, but merely on 

 the surface of the receptacle; calyx spreading. Leaflets 

 thin. 



