Leersia hexandra
Leersia lenticularis
clubhead cutgrass, southern cutgrass, swamp rice grass
catchfly grass, oatmeal 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.
50-150 cm tall, 1-3 mm thick, usually ascending, unbranched or branched;
nodes retrorsely hispidulous, adjacent portion of the internodes glabrous.
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 scabrous;
ligules 0.5-1.5 mm;
blades 4-35 cm long, 5-22 mm wide, spreading to somewhat ascending, abaxial surfaces glabrous or scabridulous, adaxial surfaces glabrous or pubescent, margins usually scabrous.
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.
4-25 cm, exserted, with 1(2) branches per node;
branches 8-15 cm, spreading, secund, lower branches naked on the lower 73, spikelets strongly imbricate.
3.2-4.7(5) mm long, 0.5-2 mm wide, ovate to elliptic.
4-5.5 mm long, 3-4 mm wide, broadly elliptic to suborbicular.
about 2 mm, usually not developed.
3.5-4 mm, 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.
coarsely ciliate on the keels, variously pubescent on the margins and body, mucronate;
paleas ciliate on the keels;
anthers 2.
= 48.
= 48.
Leersia hexandra
Leersia lenticularis
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 lenticularis grows in river bottoms and moist woods of the midwestern and southeastern United States. It flowers from July to November. Ohio and Maryland list it as an endangered species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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