Fringed Puccoon or Narrowleaf Stoneseed [Lithospermum incisum] found outside Broken Bow, Nebraska on 20 May 2021. It’s a member of the Borage (Boraginaceae) family. National Wildlife Federation’s Wildflowers of North America, page 161, states it blooms in spring and summer on roadsides, in open woods, and on prairies. It is different from the from the Hoary Puccoon and Western Puccoon, in that its flowers have jagged edges.
USDA Plants Listing: Lithospermum incisum