- 56 - 



55a. Principal leaves palmately compound with 5 7 leaflets (Cinque- 

 foil) 56. 



55b. Principal stem-leaves with 3 leaflets, or pinnately compound 

 with several leaflets 58. 



56a. Leaves silvery-white beneath, laciniately toothed (14 dm. 

 high; late spring and summer) 



Silvery Cinquefoil, Fotentilla argentea. 



56b. Leaves not silvery-white beneath (310 dm. high; sum- 

 mer) 57. 



57a. Terminal leaflet more than 3 times as long as wide 



Cinquefoil, Potentilla recta. 

 57b. Terminal leaflet less than 3 times as long as wide 



Cinquefoil, Potentilla intermedia, 

 58a. Flowers about 4 mm. wide (2 6 dm. high; spring) 



Spring- Avens, Geum vermim. 

 58b. Flowers 6 mm. wide, or wider 59. 



59a. Principal leaves with lobed leaflets, of which the terminal is 

 the largest; leaf-axis bearing also some small leaflets between 

 those of usual size (4 12 dm. high; late spring and sum- 

 mer) (Avens) . 60. 



59b. Principal leaves with toothed or pinnately cleft leaflets, the lat- 

 eral ones about equaling the terminal one in size, and without 

 any small scattered leaflets (3 8 dm. tall; summer) (Cinque- 

 foil) 61. 



60a. Terminal leaflet cordate at base Avens, Geum macrophyllum. 



60b. Terminal leaflet wedge-shape or acute at base 



Ayens, Geum strictum. 



61a. Leaflets 3 Cinquefoil, Potentilla monspeliensis. 



61b. Leaflets 515 62. 



62a. Leaflets crenate Cinquefoil, Potentilla paradoxa. 



62b. Leaflets deeply incised 



Cinquefoil, Potentilla pennsylvanica. 



63a. Leaves all basal, the flowers on leafless stalks 64. 

 63b. Stem-leaves present 66. 



64a. Leaves simple (1 2 dm. high; summer) 



Dalibarda, Dalibarda repens. 



64b. Leaves trifoliate (1 2 dm. high; 'spring) (Strawberry) 65. 



65a. Leaflets thick and firm, the petioles and pedicels pubescent with 

 spreading or ascending hairs; fruit subglobose, the achenes 

 embedded in pits on its surface 



Strawberry, Fragaria yirginiana. 



65b. Leaflets thin, the petioles and pedicels nearly glabrous or with 

 appressed hairs; fruit conic, the achenes on its surface 



Wood Strawberry, Fragaria americana. 



66a. Leaves pinnate with numerous leaflets 67. 

 66b. Stem-leaves with 35 leaflets 12. 



