Culms 40-210 cm; internodes green. Leaves green or slightly
glaucous, glabrous or pubescent, at least on the margins near the collar. Inflorescence
units with 2-5(7) rames; subtending sheaths (2.2)3.3-4.4(5.6) mm
wide; peduncles (2)3-6(12) mm; rames (0.5)1.9-3.3(4.4) cm, not
Andropogon virginicus var. virginicus is the widespread and weedy
variety of A. virginicus that grows as a native species from the central
plains through Mexico and Central America to Colombia and, as a naturalized
species, in California, Hawaii, Japan, and Australia. Plants colonizing openings
in mature vegetation created by disturbance have green culms and green, pubescent
leaves. Those growing in poorly drained soils of pond margins, swales, and cutover
flatwoods have glaucous culms and glabrous, green to somewhat glaucous leaves.
Glaucous plants of A. virginicus var. virginicus differ from those
of var. decipiens in having no
exposed rames and, often, wider sheaths subtending the inflorescence units.
Lvs seldom over 3 dm; stem-sheaths glabrous; infl slender, elongate, simple or racemosely branched, the branches when present rarely surpassing the third node above their base; uppermost nodes mostly glabrous; fertile spikelets avg 3.6 mm; sterile spikelet very seldom developed; dry soil of fields and open woods; Mass. to s. Ont., O., Mo., and Kans., s. to Fla. and Tex.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.