Plants annual or perennial. Culms 15-100 cm, round, glabrous
or appressed-pubescent; internodes hollow. Sheaths sometimes
flattened below, usually glabrous, sometimes sparsely pilose at the apices; ligules
1.8-5.4 mm, truncate, erose or ciliate; blades (1)5-30 cm long,
4-8 mm wide, glabrous, sometimes scabridulous. Panicles 20-50 cm,
with 25-60 racemose branches; branches (1)4-8(14) cm, erect to
slightly reflexed, usually straight.
Spikelets 2.5-3.7 (4.2) mm, imbricate to somewhat distant, green
to tan, with 4-6 florets. Glumes triangular to lanceolate; lower
1.1-1.7 mm; upper glumes 1.6-2 mm; rachilla internodes usually
visible between the florets; lemmas 1.2-1.7 mm, ovate to elliptic,
glabrous or hairy along and between the veins, apices broadly acute or
glabrous or hairy; anthers 3, 0.4-0.6 mm. Caryopses 0.9-1.9
mm long, 0.6-0.8 mm wide. 2n = 40.
Leptochloa chinensis is not yet known from the Flora region but it is considered a noxious weed by the U.S. Department of Agriculture
because it would probably displace native species in
undisturbed mesic sites. Although it resembles L.
panicea, L. chinensis differs in its glabrous, or nearly glabrous,
sheaths and blades.