Plants perennial; cespitose. Culms 30-80 cm, usually erect; nodes
and internodes appressed pubescent. Sheaths glabrous or pilose,
margins ciliate; ligules to 2 mm, membranous, ciliate; blades
to 20 cm long, usually less than 2 mm wide, filiform, scabrous adaxially. Panicles
1-5 cm long, 1-3 cm wide, occasionally reduced to a raceme. Spikelets
9-12 mm, with 2-5 florets. Glumes subequal, 3.4-4.5 mm, acuminate; lemmas
4-8 mm, lobes 4.5-8 mm, tapering to the acute apices; awns 8-11 mm, divergent;
paleas 2-3 mm, keels ciliate; anthers 1.5-2 mm, yellow. Caryopses
1.5-2.5 mm, ovoid, tan. 2n = unknown.
Triplasis americana is endemic to the southeastern United States. It
grows on sandy soils in prairies and woods, being less common in maritime dunes
than Triplasis purpurea.