Aristida purpurascens Poir. - Arrowfeather Threeawn


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Aristida purpurascens - (image 1 of 3)



Family: Poaceae


Dry sandy soil and prairies.




MA to southern Ontario, WI, and KS, south to FL and TX.


Herbaceous perennial; culms 40-100 cm, tufted on a knotty base; leaves to 20 cm, mostly flat, 1-4 mm wide; lower sheaths covering the nodes, usually more or less pilose; inflorescence 10-20 cm, slender, loosely or densely spike-like, with short, ascending or appressed branches; glumes 1-veined, the first 8-14 mm, scabrous on the keel and sometimes on the sides, the second 6.5-11.5 mm, almost always exceeding the lemma and exceeded by the first glume; lemma 5.5-9.5 mm; awns about equally divergent, the central one 2-3.5 cm, the lateral 1.5-2.5 cm.


Flowers July to September

Wetland indicator: UPL

Photographed in a sand prairie in northwest Ohio.


Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY




Michael Hough 2018