Carex ozarkana
Carex ozarkana, the Ozark sedge, is a species of flowering plant in the family Cyperaceae, native to the U.S. states of Oklahoma, Texas, Arkansas, and Louisiana. Description 
A perennial forming loose tufts and reaching , it is found growing in permanently wet soils. The culms were between 45 to 95 centimeters in diameter. The vegetative culms are inconspicuous. The leaves sheaths are sometimes white mottled, green-veined near the collar, and Y-shaped. There are between 3 to 5 blades on culms. The inflorescence are either open or dense, yellowish-brown in color, and between 2.3 to 8.4 centimeters long and between 6 to 17 millimeters wide. The spikes are either conic or globose, between 8 to 19 millimeters long and 4.2 to 8.2 millimeters wide. The pistillate scales are either yellowish brown or reddish brown with a green mid-stripe, between 3 to 4 millimeters in diameter, and are shorter and narrower than the pergynia. The perigynia is either pale yellow or gold brown with green wings and beak. The achenes are elliptic, between 1.4 to 2 millimeters long, .9 to 1.2 millimeters wide, and 0.4 to 0.5 millimeters thick. It is a grass-like perennial that could grow up to 3 or 3 and a half feet tall. The fruit type was an achene. The flower color ranged from yellow, to green, to brown. The fruiting period was between the months of May and June. The flowers are inconspicuous, and don't have an bloom time. References

ozarkana
Endemic flora of the United States
Flora of Oklahoma
Flora of Texas
Flora of Arkansas
Flora of Louisiana
Plants described in 1996