Leersia lenticularis
Leersia hexandra
catchfly grass, oatmeal grass
clubhead cutgrass, southern cutgrass, swamp rice grass
50-150 cm tall, 1-3 mm thick, usually ascending, unbranched or branched;
nodes retrorsely hispidulous, adjacent portion of the internodes glabrous.
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.
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.
glabrous or coarsely scabrous, margins often ciliate;
ligules 1-3 mm;
blades 5-25 cm long, 3-15 mm wide, ascending, glabrous or pubescent.
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.
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.
4-5.5 mm long, 3-4 mm wide, broadly elliptic to suborbicular.
3.2-4.7(5) mm long, 0.5-2 mm wide, ovate to elliptic.
3.5-4 mm, reddish-brown.
about 2 mm, usually not developed.
coarsely ciliate on the keels, variously pubescent on the margins and body, mucronate;
paleas ciliate on the keels;
anthers 2.
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.
= 48.
= 48.
Leersia lenticularis
Leersia hexandra
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.)
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.)
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