Andropogon liebmannii has two varieties. Andropogon liebmannii var. pungensis (Ashe) C.S. Campb., the variety found in the Flora region, differs from A. liebmannii Hack. var. liebmannii, which grows in Mexico, in having culms that are usually more than 80 cm tall, leaves that are more than 15 cm long, and sessile spikelets that are more than 4.2 mm long; in var. pungensis the culms are usually less than 90 cm tall, the leaves less than 15 cm long, and the sessile spikelets less than 4.2 mm long.
Andropogon liebmannii var. pungensis grows along the coastal plain of the southeastern United states in bog, swamp, savannahs, and flatwoods. It used to be treated as a species, which was known as A. mobrii. The English name "Mohr's Bluestem" reflects this treatment.