Packera greenei is a species of flowering plant in the aster family known by the common name flame ragwort. It is endemic to northern California, where it is known from the North Coast Ranges and southern Klamath Mountains. It is a resident of dry mountain scrub habitat, often on serpentine soils. The inflorescence contains one or more flower heads, each lined with woolly, green- or red-tipped phyllaries. The head bears up to 13 narrow ray florets which are a distinctive orange or red-orange in color. They may approach 2 centimeters long.