Leersia hexandra
Leersia virginica
clubhead cutgrass, southern cutgrass, swamp rice grass
leersie de virginie, white cut grass, white grass
25-150 cm tall, 1-1.5 mm thick, decumbent, rooting at the nodes, terminal portions erect, often floating, branched or unbranched;
nodes pubescent, adjacent portions of the internodes glabrous or coarsely scabrous.
30-140 cm tall, 1-1.5 mm thick, branched, sometimes rooting at the nodes, more or less glabrous, pubescent near the nodes.
glabrous or coarsely scabrous, margins often ciliate;
ligules 1-3 mm;
blades 5-25 cm long, 3-15 mm wide, ascending, glabrous or pubescent.
glabrous or slightly scabrous;
ligules 1-3 mm;
blades 4-20 cm long, (1)6-15 mm wide, flaccid, surfaces glabrous or puberulent or the abaxial surfaces sometimes densely pilose, margins hispid.
5-15 cm, exserted at maturity, with 1(2) branches per node;
branches 3-10 cm, appressed to ascending, spikelet-bearing to near the base, spikelets appressed to slightly divergent, slightly imbricate.
10-25 cm, long-exserted at maturity, with 1 branch per node;
branches 4-8 cm, spreading, naked on the lower 73, spikelets more or less appressed, scarcely imbricate.
3.2-4.7(5) mm long, 0.5-2 mm wide, ovate to elliptic.
2.5-3.6 mm long, 0.4-1.2 mm wide, oblong or ovate.
about 2 mm, usually not developed.
2-2.4 mm, slightly compressed, reddish-brown.
ciliate on the keels and margins, short hispid or glabrous elsewhere, apices acute to acuminate;
paleas ciliate on the keels;
anthers 6, 2-3.2 mm.
ciliate to nearly-glabrous on the keels and margins, glabrous or short-pubescent on the body;
paleas glabrous or slighdy ciliate on the keels;
anthers 2.
= 48.
= 48.
Leersia hexandra
Leersia virginica
Leersia hexandra is found in wet areas, usually in fresh water along streams and ponds, where it sometimes forms floating mats. It grows in the southeastern United States and throughout much of the neotropics; the California record probably represents a recent introduction.
Leersia hexandra is sometimes a weed in rice. It usually flowers in late fall, but may flower throughout the year. Very little seed is set.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Leersia virginica grows in moist places in woods and along stream courses east of the Rocky Mountains. The western Wyoming record may represent an introduction. Leersia virginica flowers from July to October.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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