Isocarpha megacephala

Isocarpha megacephala is a New World species of plants in the sunflower family. It has been found only in northeastern Brazil (Bahia, Pernambuco, Paraíba).
"Isocarpha megacephala" is an annual or perennial herb up to tall. Leaves are up to long. One plant produces several flower heads, each across (thus larger than the other species) each head on a long flower stalk, each head with 200-300 white disc flowers but no ray flowers.