104b. Heads 10 25-flowered (5-10 dm. high; flowers white, late summer) =False Boneset, Kuhnia eupatorioides.= 104c. Heads with more than 50 flowers (3-20 dm. high; flowers white, summer) =Fireweed, Erechtites hieracifolia.= 105a. Leaves entire, with many veins from base to apex =Indian Plantain, Cacalia tuberosa.= 105b. Leaves sharply serrate =Indian Plantain, Cacalia suaveolens.= 105c. Leaves broadly triangular or kidney-shape, sinuate or entire =Indian Plantain, Cacalia atriplicifolia.= 106a. Leaves united at the base (5-15 dm. high) =Boneset, Eupatorium perfoliatum.= 106b. Leaves sessile but not united at the base (5-15 dm. high) =Upland Boneset, Eupatorium sessilifolium.= 106c. Leaves petioled (4-12 dm. high) =White Snakeroot, Eupatorium urticaefolium.= 107a. Inflorescence ovoid or pyramidal =Joe-Pye Weed, Eupatorium purpureum.= 107b. Inflorescence depressed or flattened =Joe-Pye Weed, Eupatorium purpureum var. maculatum.= 108a. Rays yellow or brown --109. 108b. Rays white to blue or red, never yellow or brown --197. 109a. Principal leaves basal, the stem merely with bract-like scales --110. 109b. Principal leaves on the stem, opposite or whorled --111. 109c. Principal leaves on the stem, alternate, or with smaller ones clustered in their axils --132. 110a. Flower-stalk 1-5 dm. high, 1-flowered (spring) =Coltsfoot, Tussilago farfara.= 110b. Flower-stalk 1-3 m. high, several-flowered (summer) =Prairie Dock, Silphium terebinthinaceum.= 111a. Ray-flowers pistillate (the 2-lobed style protrudes from their base) --112. 111b. Ray-flowers with neither stamens nor pistil --118. 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 uvedalia.= 113b. Rays 5 (5-15 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 integrifolium.=