Button Blazing Star - Liatris aspera

Also called Rough Blazing Star.

Features: A classic prairie plant that makes a great companion for native grasses, which provide it support, or as an accent in your sunny garden.

Clusters of purple flowers attract many butterflies and other pollinators.

Light: Full sun

Soil: Dry 

Height:  2-3 feet

Blooms: August to September

See more information and photos at: Illinois Wildflowers and USDA Plants Database

Image from Possibility Place