Solidago rigida
    Stiff Goldenrod

In September, the flowers of this distinctive goldenrod are prominent in open areas of oak savannas.

    Links

Solidago rigida: Information about growth habits, appearance, and uses from the Michigan Chapter of Wild Ones.

Solidago rigida: on the hort.net photo gallery.

Solidago rigida: from the Native Wildflowers of the North Dakota Grasslands by the USGS.

Solidago rigida: Perennial Gardening on the Prairies.