Plants in small clumps, with rhizomes 3-5 mm thick. Basal
rosettes well-differentiated; blades sometimes more than 10 cm, lanceolate.
Culms 50-150 cm, usually robust, erect; nodes often swollen, densely
bearded with thin retrorse hairs above a constricted, glabrous, viscid ring;
internodes grayish-purple, velvety-pubescent; fall phase branching
from the mid- and upper culm nodes, with long, repeatedly forking and often
recurving branches, ultimately with fascicles of reduced blades and included
secondary panicles. Cauline leaves 7-11; sheaths not overlapping,
narrowing distally, lustrous, bases sparsely to densely retrorsely villous,
hairs papillose-based, summits purplish, with yellowish spots; collars
densely villous; ligules 0.5-2 mm, of hairs; blades 9-20 cm long,
9-20 mm wide, thick, densely soft pubescent, bases rounded to subcordate, margins
ciliate basally. Primary panicles 6-16 cm long, 5-12 cm wide, well-exserted,
dense; rachises softly pubescent basally; branches often mottled
with purplish viscid spots, glabrous. Spikelets 2.2-2.8 mm long, 1.3-1.5
mm wide, ovoid-ellipsoid, often purplish basally, prominently veined, margins
and apices sparsely to densely pubescent, hairs papillose-based. Lower glumes
0.6-1.3 mm, subtruncate to acuminate; lower florets sterile; upper
florets minutely apiculate. 2n = 18.
Dichanthelium scoparium grows in moist, sandy, open, often disturbed
areas of the southeastern United States. It is also present in the West Indies.
The primary panicles are open-pollinated, produced from May to early August;
the secondary panicles are cleistogamous and are produced from July through
October.
Panicum glutinoscabrum Fernald may represent rare putative
hybrids of Dichanthelium scoparium with D.
acuminatum, and P. mundum Fernald, rare hybrids with D. dichotomum.
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