Helianthus annuus
Common in the northeastern part of the state along roadsides and the like. Similar to Helianthus petiolaris but readily distinguished by having very broad, abruplty attenuate-tipped phyllaries. My pictures are from Indiana & Oklahoma.
Pseudanthium & leaves at Black Kettle National Grassland, Oklahoma, 14 Aug 2004
Immature pseudanthium, showing phyllaries, 14 Aug 2004.
Cauline leaves, Black Kettle National Grassland, 14 Aug 2004.
A pseudanthium in Bloomington, IN, 9/3/03.
A stem with buds in Bloomington IN, 9/3/03.