140 



GRAMINEAE. 



2. Oryzopsis micrantha (Trin. & Rupr. ) Thurb. Small-flowered 

 Mountain Rice. (Fig. 315.) 



Urachne micrantha Trin. & Rupr. Mem. Acad. St. 



Petersb. (VI.) 5: 16. 1842. 

 Oryzopsis micrantha Thurb. Proc. Phila. Acad. 1863: 



78. 1863. 



Culms glabrous, i-2y 2 tall, erect, slender, sim- 

 ple, smooth. Sheaths shorter than the internodes; 

 ligule about y 2 " long, truncate ; leaves erect, scab- 

 rous, the basal one-half the length of the culm, less 

 than y 2 " wide, usually more or less involute, the 

 culm leaves 2 / -8 / long, j^ // -i // broad, the larger 

 attenuate into a long slender point; panicle 3'-6' 

 long, the branches finally spreading, the lower ones 

 i / -2 / long, naked for about two-thirds their length ; 

 spikelets i // -ij4 // long, the outer scales about 

 equal, acute, glabrous ; third scale shorter, glab- 

 rous, bearing an awn 3 // -4 // long. 



South Dakota to Nebraska, New Mexico and Arizona. 

 June-July. 





3. Oryzopsis asperifolia Michx. White-grained Mountain Rice. (Fig. 316.) 



Oryzopsis asperifolia Michx. Fl. Bor. Am. i: 51. 1803. 

 Urachne asperifolia Trin. Unifl. i: 174. 1824. 



Culms glabrous, io / -2o / tall, erect, simple, smooth 

 or scabrous. Sheaths i / -2 / long, crowded at base; 

 ligule very short, truncate ; leaves erect, scabrous, es- 

 pecially above, the basal ones elongated, often equal- 

 ling or exceeding the culm, 2 / '-4 // wide, attenuate 

 into a long point, the i or 2 culm leaves much reduced, 

 less than YJ.' long ; panicle 2'-$' long, contracted, the 

 branches i' in length or less, erect ; spikelet, exclusive 

 of awn, 3 // -4 // long; outer scales glabrous, usually 

 apiculate, the first somewhat shorter ; third scale 

 whitish, equalling the second or a little shorter, spar- 

 ingly pubescent, the awn 3> // -5 // long. 



In woods, Nova Scotia to British Columbia, south to 

 New Jersey, Pennsylvania, Minnesota and in the Rocky 

 Mountains to New Mexico. May-June. 



4. Oryzopsis melanocarpa Muhl. Black- 

 fruited Mountain Rice. (Fig. 317.) 



Oryzopsis melanocarpa Muhl. Gram. 79. 1817. 

 Urackne racemosa Trin. Unifl. i: 174. 1824. 



Glabrous, culms i>^ -3 tall, erect, simple, roughish. 

 Sheaths smooth or scabrous, the lower ones usually 

 longer, the upper slightly shorter than the interuodes; 

 ligule very short; leaves 5 / -i2 / long, 2 // -7 // wide, nar- 

 rowed toward the base, acuminate at apex into a long 

 slender point, scabrous especially above ; panicle 

 branched or nearly simple, 3 / -i2 / long, its branches 

 2 / -4 / long, spreading or ascending, the lower half 

 naked ; outer scales of the spikelet about equal, 

 3"-4 // in length, acute ; third scale shorter, acute dark 

 colored, sparingly pubescent, the awn S // -i2 // long. 



Rocky woods, Vermont and Ontario to Minnesota, south 

 to New Jersey, Kentucky and Missouri. July-Aug. 



