98 IOWA ACADEMY OF SCIENCE 
COREOPSIS L. 
952. Coreopsis palmata Nutt. Stiff Tickseed. Common in fields and 
meadows. 
953. Coreopsis tripteris L. Tall Tickseed. Common in moist fields and 
open places. 
BIDENS L. 
954. Bidens frpndosa L. Black Beggar Ticks. Common in moist soils. 
955. Bidens vulgata Greene. Beggar Ticks or Stick Tight. More abun- 
dant than the preceding in similar soils. 
956. Bidens comosa (Gray) Wieg. Leafy Bracted Tickseed. Common 
in sandy soils especially along streams. 
957. Bidens cernna L. Nodding Bur Marigold. Common on muddy 
shores of streams and ponds. 
958. Bidens involucrata (Nutt) Britt. Long Bracted Sunflower Tick- 
seed. Rare in swampy places. Hills Siding. 
HELENIUM L. 
959. Helenium autumnale L. Sneezeweed. Abundant in moist fields 
and meadows. 
DYSSODIA Cay. 
960. Dyssodia. papposa (Vent) Hitchc. Foetid Marigold. Locally 
plenty in moist open places. 
ACHILLEA (Vail) L. 
961. Achillea lanulosa Nutt. Western Yarrow. Common in fields and 
open places. This has commonly been listed as the following 
species. 
962. Achillea millefolium L. Yarrow or Milfoil. Relatively scarce in 
fields and open places. 
ANTHEMIS (Mich) L. 
963. Anthemis cotida L. Dog-fennel or Foetid Camomile. A roadside 
weed, formerly very abundant but recently rather scarce. 
CHRYSANTHEMUM (Tourn) L. 
964. Chrysanthemum leucanthemum L. Var. pinnatifidum Lecoq & La- 
motte. Ox-eye Daisy. Scarce in fields and along railways; 
introduced. 
TANACETUM M. » 
965. Tanacetum vulgare L. Common Tansy. Not rare in fields and 
waste places. 
