Oryzopsis racemosa (Sm.) Hitchc. - Black-seeded Rice Grass


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Oryzopsis racemosa - (image 1 of 5)



Family: Poaceae


Dune slopes, wooded bluffs and ravines. Rocky woods. Fire adapted.




Quebec to Ontario, MN, and ND, south to VA, KY, MO, and NE.


Perennial from a knotty rhizome, to 1 m. Leaves mostly cauline, flat, scaberulous above, pubescent below, finely veined; ligule small or absent; inflorescence paniculate, sparsely branched; spikelets 1-flowered, articulated above the glumes, appressed; glumes herbaceous, acute or short-acuminate, equal or nearly equal, 7-veined; lemma dark brown and shiny, to 7 mm; awn to 22 mm.


Flowers early to mid August.

Wetland indicator: Upland

Similar to O. asperifolia (Rough-leaved Ricegrass), which has the blade of the uppermost leaf reduced in size (0-3 cm), and a racemiform inflorescence.



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


Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.



 Michael Hough 2005