GENUS 31. 



GRASS FAMILY. 



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



Small Indian Millet. Fig. 415. 



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



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

 O. micrantha Thurb. Proc. Phila. Acad. 1863: 78. 1863. 



Culms glabrous, i-2i tall, erect, slender, simple, 

 smooth. Sheaths shorter than the internodes ; ligule 

 about \" long, truncate; blades erect, scabrous, the 

 basal one-half the length of the culm, less than i" 

 wide, usually more or less involute, the culm leaves 

 2 r -8' long, i"-i" broad, the larger attenuate into a 

 long slender point ; panicle 3'-6" long, the branches 

 finally spreading, the lower ones i'-2 r long, naked for 

 about two-thirds their length; spikelets i"-ii" long, 

 the outer scales about equal, acute, glabrous ; third 

 scale shorter, glabrous, bearing an awn 3"-4" long. 



In canons and on dry hills, Saskatchewan to Nebraska, 

 New Mexico and Arizona. June-July. 



3. Oryzopsis asperifolia Michx. White-grained 

 Mountain-rice. Fig. 416. 



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 sca- 

 brous. Sheaths i'-2' long, crowded at base; ligule very 

 short, truncate ; blades erect, scabrous, especially above, the 

 basal ones elongated, often equalling or exceeding the 

 culrri, 2"-4" wide, attenuate into a long point, the i or 2 

 culm-blades much reduced, less than long; panicle 2'~3' 

 long, contracted, the branches i' in length or less, erect; 

 spikelet, exclusive of awns, 3"-4" long; outer scales gla- 

 brous, usually apiculate, the first somewhat shorter; third 

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

 ingly pubescent, the awn 3l"-s" long. 



In woods, Newfoundland to British Columbia, south to New 

 Jersey, Pennsylvania, Minnesota and in the Rocky Mountains 

 to New Mexico. May-June. 



4. Oryzopsis racemosa (J. E. Smith) Ricker. 

 Black-fruited Mountain-rice. Fig. 417. 



Milium racemosum J. E. Smith, in Rees, Cyclop. 23: no. 15. 



1813. 



Oryzopsis melanocarpa Muhl. Gram. 79. 1817. 

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

 Oryzopsis racemosa Ricker; Hitchc. Rhodora 8: 210. 1906. 



Glabrous, culms ii-3 tall, erect, simple, roughish. 

 Sheaths smooth or scabrous, the lower ones usually 

 longer, the upper slightly shorter than the internodes; 

 ligule very short ; blades 5'-i2' long, 2" -7" wide, narrowed 

 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, spread- ' 

 ing 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 8"-i2" long. 



Rocky woods, Maine to Ontario, south to Maryland and Kentucky. July-Aug. 



