130 



195a. Leaves green on both sides; bracts longer than the disk 



Sunflower, llelianthus tracheliifolius. 



195b. Leaves paler below than above; bracts not longer than the 

 disk 196. 



196a. Leaves minutely pubescent beneath 



Sunflower, Helianthus strumosus. 

 196b. Leaves conspicuously downy beneath 



Sunflower, Helianthus strumosus yar. mollis. 



197a. Leaves all basal, the flowers on scaly stalks (2 8 dm. high; 

 flowers whitish, in spring) Coltsfoot, Petasites palmata. 



197b. Stem-leaves present, opposite 198. 

 197c. Stem-leaves present, alternate 200. 



198a. Leaves ovate, dentate, 2 6 cm. long (2 8 dm. high; sum- 

 mer) (Galinsoga) 199. 

 198b. Leaves lobed, 10 25 cm. long 113b. 



199a. Pubescence sparse, appressed 



Galinsoga, Galinsoga paryiflora. 

 199b. Pubescence abundant, spreading 



Galinsoga, Galinsoga parriflora yar. hispida. 



200a. Leaves dissected or deeply lobed or pinnatifid; pappus 

 never capillary; rays white to pink (310 dm. high; summer 

 .and autumn) 20,1. 

 200b. Leaves entire or serrate 206. 



201a. Heads 48 mm. wide (Yarrow) 202. 

 201b. Heads 12 50 mm. wide 203. 



202a. Flower-clusters flat-topped Yarrow, Achillea millefolium. 

 202b. Flower-clusters very convex Yarrow, Achillea lamilosa. 



203a. Principal leaves pinnatifid 213a. 



203b. Principal leaves 1 3 times pinnately parted or dissected 204. 



204a. Leaf-segments very narrowly linear; leaves 2 3-pinnate 



205. 

 204b. Leaf-segments linear or lanceolate; heads 2.5 5 cm. 



wide Camomile, Anthemis aryensis. 



204c. Leaf-segments ovate to ovate-oblong; heads 1 2 cm. wide 



Feyerfew, Chrysanthemum parthenium. 



205a. Foliage strongly scented Bog Fennel, Anthemis cotnla. 



205b. Foliage not ill-scented Wild Camomile, Matricaria inodora. 



206a. Heads 36 mm. broad, including the rays (summer and 



autum) 207. 

 206b. Heads 7 mm. broad or larger, including the rays 209. 



207a. Rays purple (1 4 dm. high) Horse Weed, Erigeron diyaricatus. 

 207b. Rays white 208. 



