li·​atris | \ līˈa‧trə̇s, ˈlīə‧t- \

Definition of liatris

1 capitalized : a genus of perennial American herbs (family Compositae) having aromatic often cormous roots, linear grassy leaves, and spikes of rose-purple or white discoid heads of perfect tubular flowers — see blazing star, button snakeroot
2 plural -es : any of several herbs of Liatris or the closely related genus Trilisa (as wild vanilla and the button snakeroot) sometimes used in medicine

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“Liatris.” Dictionary, Merriam-Webster, Accessed 9 Jul. 2020.

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