Xyris stricta var. obscura
Novon 9: xxx, fig. 8. 1999.
Herbs, 40–80(–85) cm. Leaves (15–)20–40(–44) cm; blade mostly (2–)2.5–3(–5) mm wide, margins papillate to ciliolate. Inflorescences: scapes terete, ribs 2, strong, distal, with additional narrower, but still strong ribs; all ribs scabrous or scabro-ciliolate; spikes ellipsoid to ovoid or lanceoloid, 1–2(–2.7) cm; fertile bracts nearly orbiculate, 5–6.5(–7) mm, margins entire. Flowers: lateral sepals (4.5–)5–6(–7) mm. Seeds 6–7(–8) mm.
Phenology: Flowering summer–fall.
Habitat: Moist sands and sandy peats of pine savanna, bogs, clearings, ditchbanks, coastal plain
Elevation: 0–200 m
Ala., Fla., Ga., La., Miss., Tex.
In Louisiana, Alabama, northwest Florida, and Georgia are what appear to be intergrades with Xyris stricta var. stricta.