t, 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; summer)
(Galinsoga) --199.

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

199a. Pubescence sparse, appressed =Galinsoga, Galinsoga parviflora.=

199b. Pubescence abundant, spreading
=Galinsoga, Galinsoga parviflora var. hispida.=

200a. Leaves dissected or deeply lobed or pinnatifid; pappus never
capillary; rays white to pink (3-10 dm. high; summer and
autumn) --201.

200b. Leaves entire or serrate --206.

201a. Heads 4-8 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 lanulosa.=

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 arvensis.=

204c. Leaf-segments ovate to ovate-oblong; heads 1-2 cm. wide
=Feverfew, Chrysanthemum parthenium.=

205a. Foliage strongly scented =Dog Fennel, Anthemis cotula.=

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

206a. Heads 3-6 mm. broad, including the rays (summer and autumn)
--207.

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

207a. Rays purple (1-4 dm. high) =Horse Weed, Erigeron divaricatus.=

207b. Rays white --208.

208a. Leaves obovate to oblong (3-10 dm. high) --135a.

208b. Leaves linear or narrowly lanceolate (2-25 dm. high)
=Horse Weed, Erigeron canadensis.=

209a. Pappus none, or minute and not of hairs (summer and autumn) --210.

209b. Pappus of hairs --214.

210a. Disk-flowers purple or brown (4-12 dm. high; rays pink)
(Purple Coneflower) --211.

210b. Disk-flowers yellow or nearly white --212.

211a. Leaves ovate or ovate-lanceolate, most of them serrate
=Purple Coneflower, Brauneria purpurea.=

211b. Leaves narrowly lanceolate, gradually narrowed at the base, enti