Descriptive Flora 



Page 



Sap not milky, 

 r. Foliage or stems white-woolly. 



1. Plants 1 — 2y 2 ' high, leaves 



deeply cut . Hymenopappus— 236 



2. Leaves not deeply cut. 



(a) Leaves all basal Chaptalia — 243 



(b) Leaves not all basal. 



(1) Plants 1—6" high, 

 branches spreading, 



heads woolly . Filago — 224 



(2) Plants erect, 6—18" 



high, heads not woolly Gnaphalium — 225 



. . .. . X?) Plants 2—4' high, blos- 

 soming in fall Artemisia — 240 



s. Foliage not white-woolly. 



(a) Ray-flowers strap-shaped (In 

 Parthenium and Leptilon the 

 rays are scarcely visible) . . . 



1. Ray flowers inconspicuous, 



apparently none Erigeron — 224 



2. Ray flowers few, usually 4 

 or 5. 



(m) Leaves deeply segmented. 



(1) Rays small, about 1/12" 



long Parthenium — 227 



(2) Rays at least % " long Achillea— 239 



(n) Leaves not deeply seg- 

 mented. 



(1) Blades large, continuing 



on the stem Verbeslna — 232 



(2) Blades not continuing 

 on the stem. 



o. Stems slender, flowers 



about 1 / 4" across Chaetopappa — 221 



p. Flowers showy, % — 1" 



across Melampo&lum — 226 



3. Rays about 12. 



(1) Flowers less than 

 across. 



1. Plant 6—16" high, stems 

 slender, branched at 



