Aristida oligantha

prairie three-awn grass, prairie threeawn, oldfield (prairie) threeawn, oldfiled prairie 3-awn, oldfield threeawn
Family

Poaceae

Leaf Arrangement

alternate

Leaf Type

simple

Growth Form

graminoid

Flower Color

green, purple

Flower Month

June - October

Height (meters)

0.2 - 0.6

Milky Sap

No

Armed/Unarmed

Unarmed

Origin

native

Lifespan

annual

Growing Season

Warm season


Prairie Coefficient of Conservatism

4

Field Characters

Aristida oligantha can be distinguished from A. longespica by its lemma awns which are equal in length, while those of A. longespica are unequal in length. The awns of A. longespica are never twisted while those of A. oligantha are sometimes slightly twisted at their base.

Animal Use

The following information for the genus Aristida: Animals that eat its seeds: Pine-woods sparrows, white-footed mouse. Animals that eat the plant: Jack rabbit, white-footed mouse, white-tailed deer (Martin et al. 1951). Is unpalatable and thus rarely grazed.

Natural History

Aristida oligantha is adapted to a variety of soil types and occurs in prairies throughout the United States except for 3 or 4 of the most western states. Prairie 3-awn invades overstocked native range and low fertility pastures. It does not compete well with more vigorous grasses. It is unpalatable, and only the new growth is grazed, making it an increaser in overgrazed range.

Habitat

Mostly sandy or calcareous sandy soil in open ground.