Noun
Any of several grasses that are adapted to high light levels.
Little bluestem (Schizachyrium scoparium) and others of the genus Schizachyrium.
Big bluestem (Andropogon gerardii) and others of the genus Andropogon
Cane bluestem, Caucasian bluestem and others of the genus Bothriochloa.
Source: en.wiktionary.org