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broom sedge, broomsedge bluestem

Habit Plants cespitose, dense and cylindrical to obpyramidal above.
Culms

40-210 cm;

internodes glaucous or not;

branches erect to ascending, usually straight, sometimes arching.

Sheaths

usually smooth, rarely somewhat scabrous;

ligules 0.2-1 mm, ciliate, cilia 0.2-1.3 mm;

blades 11-52 cm long, 1.7-6.5 mm wide, smooth and glabrous or sparsely to densely pubescent with spreading hairs.

Inflorescence units

6-195 per culm; subtending sheaths (2.1)3.1-4.6(6.7) cm long, (1.7)3-3.8(5.6) mm wide;

peduncles usually (1)4-6(30) mm, with 2-7 rames;

rames (0.5)1.7-2.8(4.4) cm, sometimes exerted at maturity, pubescence sparse basally and increasing in density distally within each internode.

Sessile

spikelets (2.6)3.5-3.8(4.7) mm;

callus hairs 1-3 mm;

keels of lower glume usually smooth below midlength, scabrous distally;

awns 6-21 mm;

anthers 1(3), 0.6-1.5 mm, yellow or purple.

Pedicellate

spikelets vestigial to absent.

2n

= 20.

Andropogon virginicus

Distribution
from FNA
AL; AR; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WV; HI; PR; ON
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Discussion

Andropogon virginicus is native from the southeastern United States to northern South America, but has become established outide its native range in California, Hawaii, Japan, and Australia. Three varieties are recognized, two of which contain morphologically distinct variants. Andropogon virginicus hybridizes with A. glomeratus and A. longiberbis (Campbell 1986).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Leaves bluish-green, more or less strongly glaucous
var. glaucus
1. Leaves green, sometimes somewhat glaucous.
→ 2
2. Sheaths subtending the inflorescence units (1.7)2.4-3.1(4) mm wide; inflorescences units usually with 2 rames; rames (1.3)1.5-2.3(3) cm long; peduncles (1) 4-9 (30) mm long
var. decipiens
2. Sheaths subtending the inflorescences units (2.2)3.3-4.4(5.6) mm wide; inflorescence units with 2-5(7) rames; rames (0.5)1.9-3.3(4.4) cm long; peduncles (2)3-6(12) mm long
var. virginicus
Source FNA vol. 25, p. 659.
Parent taxa Poaceae > subfam. Panicoideae > tribe Andropogoneae > Andropogon > sect. Leptopogon
Sibling taxa
A. arctatus, A. bicornis, A. brachystachyus, A. floridanus, A. gerardii, A. glomeratus, A. gracilis, A. gyrans, A. hallii, A. liebmannii, A. longiberbis, A. ternarius, A. tracyi
Subordinate taxa
A. virginicus var. decipiens, A. virginicus var. glaucus, A. virginicus var. virginicus
Name authority L.
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