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


 

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Oryzopsis racemosa - (image 1 of 5)

 

Taxonomy

Family: Poaceae

Habitat

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

Associates

 

 Distribution

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

Morphology

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.

Notes

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.

 

References

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.
 


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 Michael Hough 2005