17b. Xyris difformis var. curtissii (Malme) Kral, Sida. 2: 255. 1966.
Xyris curtissii Malme, Ark. Bot. 13(8): 24. 1913; Xyris bayardii Fernald; X. neglecta Small 1894, not Alb. Nilsson 1892; X. serotina Chapman var. curtissii (Malme) Kral
Herbs, 15--20 cm. Leaves spreading-ascending in broad fans, mostly under 10 cm; sheaths reddish or purplish, rugulose-papillate; blade dull green, linear--sword-shaped, 1--4 mm wide, often papillate, margins somewhat scabrous. Inflorescences: scape sheath base rich rich, deep red-brown, lustrous; scapes linear-filiform, angulately terete, not much widened distally, several-ribbed, ribs equally prominent, somewhat scabrous; spikes mostly 5 mm or less. Seeds translucent. 2n = 18.
Flowering summer--fall. Moist to wet sands or sandy peats of bog slicks, sphagnous areas, pine savanna, pond shores, and acid seeps; 0--200 m; Ala., Ark., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.; Central America (Belize).
Xyris difformis var. curtissii remains distinct even when mixed with the other two varieties, a common event in the southern Atlantic and Gulf coastal plains.