About Aristida oligantha Michx.
Aristida oligantha Michx. is a species of grass that has the common names prairie threeawn, oldfield threeawn, and ant rice. It is native to the United States and southern Canada, and it can also be found in northern Mexico. It grows in a wide variety of habitat types, and thrives particularly in dry areas with sandy or gravelly soils. It appears in disturbed and burned areas, and is sometimes considered a weed along roadsides and railroads. This annual grass grows in clumps of branching gray-green stems with purple tints, reaching between 30 and 70 centimeters tall. Its inflorescence is an open arrangement of spikelets. Its grain has three spreading awns: the central awn can grow up to 7 centimeters long, while the other two awns are slightly shorter.
