Triplasis is a genus of North American plants in the grass family.

[2] The genus name Triplasis is Greek, meaning "threefold", referring to the triple nerved lemmas.

[3] The plants are slender-tufted perennials or annuals with short, slender leaf blades.

Their short and open purplish panicles have few flowers and terminate the culms.

Species of the genus have few-flowered spikelets and remote florets.