123 



112a. Principal leaves lobed (summer) (Leafcup) 113. 

 112b. Principal leaves toothed or entire, not lobed 115. 



113a. Rays 10 or more (1 2 m. high) Leafcup, Polymnia uyedalia. 

 113b. Rays 5 (515 dm. high) 114. 



114a. Rays shorter than the involucre or none 



Leafcup, Polymnia canadensis. 

 114b. Rays about 1 cm. long 



Leafcup, Polymnia canadensis var. radiata. 



115a. Stem 6 dm. high or less; pappus of slender hairs (spring) 



Arnica, Arnica cordifolia. 



115b. Stem usually 8 20 dm. high; pappus of short scales or none 

 (summer) 116. 



116a. Leaves united at base into a cup surrounding the stem 



Cup Plant, Silphium perfoliatum. 

 116b. Leaves closely sessile with a rounded base 



Rosin Weed, Silphium integrifoliiiim. 



116c. Leaves tapering to a short petiole; principal leaves whorled 



Kosin Weed, Silphium trifoliatum. 



116d. Leaves abruptly rounded at the sessile base, all opposite 

 (Ox-eye) 117. 



117a. Leaves smooth Ox-eye, Heliopsis helianthoides. 



11 7b. Leaves rough Ox-eye, Heliopsis scabra. 



118a. Principal stern-leaves lobed or divided 119. 

 118b- Principal stem-leaves entire or serrate 127. 



119a. Submerged aquatic; leaf-segments filiform 



Water Marigold, Bidens beckiL 



119b. Terrestrial plants; leaves merely 3-lobed (3 8 dm. high; late 



spring and summer) (Tickseed) 120. 

 119c. Terrestrial plants; leaves compound or dissected (summer and 



autumn) 121. 



120a. Leaf-lobes linear-oblong, all about equal 



Tickseed, Coreopsis palmata, 

 120b. Lateral leaf-lobes very much smaller than the terminal 



Tickseed, Coreopsis lanceolata, 



121a. Leaf-segments entire (Tickseed) 122. 



121b. Leaf-segments serrate (5 15 dm. high) (Tickseed Sunflower) 

 124. 



122a. Leaf-segments numerous, linear or nearly so (4 10 dm. 



high) 123. 

 122b. Leaf-segments 3 5, lanceolate (1 3 m. high) 



Tickseed, Coreopsis tripteris. 



