threeawn (wiregrass, needlegrass)
Aristida dichotoma Michx.

Two subspecies below, click thumbnail to see a larger image

churchmouse threeawn (wiregrass, needlegrass)
Aristida dichotoma Michx. var. dichotoma

illustration

Curtis' threeawn (wiregrass, needlegrass)
Aristida dichotoma Michx. var curtissii A. Gray

plantinflorescenceillustration

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