379] FLORA OF COLUMBIA AND VICINITY 237 



1016. H. nudiflorum Nutt. Purple sneezeweed. 

 In low grounds near the Pinnacles. 



Virginia to Missouri; Florida to Texas. 



10 1 7. H. autumnale L. Swamp sneezeweed. 

 Frequent in swamps. 



Quebec to the Northwest Territory; Florida to Ari- 

 zona. 



415. DYSODIACav. [BOEBERAW\M.l Fetid 



M.ARIGOLD. 



1018. D. chrysanthemoides Lag. [B. papposa (Vent. 

 Rydb.]. False dog-fennel. 



Common along dry banks and roadsides. 

 Ohio to Minnesota and South Dakota; Louisiana to 

 Arizona; naturalized eastward. 



416. ANTHEMIS L. Camomile. 



1019. A. Ootula L. Mayweed. 

 Common in yards and waste places. 



Europe and Asia, thence to both North and South 

 America. 



417. ACHILLEA L. Milfoil. 



1020. A. Millefolium L. Yarrow. 

 Common in fields and waste places. 



Europe and Asia, thence to North America and Aus- 

 tralia: Northern North America. 



i020a. A. millefolium lanata Koch. 



A lanate form with smaller and more finely dissected 

 leaves than the type, and with smaller rose-colored flowers, 

 occurs rarely along roadsides. 



Labrador to Alaska; Texas to California; indigenous 

 north and west; adventitious in the Eastern United States. 



418. CHRYSANTHEMUM L. \TANACETUM 



L.]. Feverfew. 



1021. O. Leucanthemum L. Ox-eye daisy. Whiteweed. 

 Waste places and fields; uncommon. 



Europe and Asia, thence to North America and New 

 Zealand. 



