GRASS FAMILY. 



5. Stipa spartea Trin. Porcupine Grass. 

 (Fig. 313.) 



tipa spartea Trin. Mem. Acad. St. Petersb. (VI.) 1-82 

 1831. 



Culms glabrous, 2-4 tall, erect, simple, smooth, 

 heaths longer than the interuodes, smooth or some- 

 hat scabrous; ligule i"-2" long, obtuse; leaves 

 mooth beneath, scabrous above, the basal one-third 



to one-half as long as the culm, i" wide or less, usually 



involute, those of the culm 6 / -i2 / long, about 2" 



wide, generally flat, attenuate into a long slender 



point; panicle finally long-exserted, 4 / -io / in length, 



its branches $'-6' long, erect, naked below; outer 

 les of spikelet i2 // -i8 // long, acuminate into a long 



slender point, glabrous; third scale y // -i2 // long, callus 



acute; awn 4 / -8 / long, stout, usually twice bent, 



tightly spiral and pubescent below, doubly spiral 

 bout the middle. 

 On prairies, Manitoba to British Columbia, south to Illinois and Kansas June -July. 



23- 



1803. 



ORYZOPSIS Michx. Fl. Bor. Am. i: 51. 

 [URACHNE Trin. Fund. Agrost. 109. 1818.] 



Usually tufted grasses, with flat or convolute leaves and paniculate inflorescence. Spikc- 

 ets i-flowered, broad. Scales 3; the two lower about equal, obtuse or acuminate; the thml 

 cale shorter or a little longer, broad, bearing a terminal awn which is early decidoooa, 

 ic callus at the base of the scale short and obtuse, or a mere scar. Stamens .y Style* dis- 

 tinct. Stigmas plumose. Grain oblong, free, tightly enclosed in the convolute scale. 

 [Greek, in allusion to the supposed resemblance of these grasses to rice, i 



About 24 species, distributed through temperate and subtropical regions, rarely extending into 

 ne tropics. Besides the following, some 7 others occur in the wi-sU-rn parts <>f North America. 

 Third scale of the spikelet glabrous or sparingly pubescent with short apprcsscd hairs 

 Spikelet, exclusive of awn, i%"-2" long. 



Awn less than i" long, much shorter than the scale : outi in length. 



i . < ' / u >: 



Awn 3" -4" long, more than twice as long as the scale ; outer scales al>ut i ', in length. 



. ran/Ma. 



.Spikelet, exclusive of awn, 3" -4" long. 



Culms nearly naked, leaves all crowded at the base; panicle 2' -3' ! 



length or less, erect. 

 Culms leafy to the top; panicle 6'-i2' long; branches 2' -4' in length. 



/Wl 



Third scale of the spikelet densely pubescent with long silky hairs. 



i. Oryzopsis juncea (Michx.) B.S.P. Slender Mountain Rice. 



Stipa j u in en Michx. I'l. Hoi. Am 

 Oiyzttpsis Canaiifiisi.^ Torr. 1 : 1. N \ -' 

 Oryzopsis juncea B. S. P. Prel. C 



Culms glabrous, 6'-2 tall, erect, slender, simple. 

 smooth. Sheaths shorter than the intercedes, usually 

 crowded at the base of the culm; lixule about i 

 decurrent; leaves smooth or scabrous, erect, involute, 

 the basal about one-half the length of the culm, occa- 

 sionally equalling it, filiform, those - 

 long, the uppermost often very small or reduced to 

 the sheath only; panicle I'-J'/ lonjj. the .rancb 

 */i'-\' in length, erect or ascending, the lower half 

 naked; spikclets i 4 "-2" long, the outer scales abo 

 equal, glabrous, whitish; third scale about the same 

 length or a little longer, pubescent with short ap- 

 pressed silky hairs, the awn less than i" long. 



In dry rocky places, Quebec (.. 1 !, sooth 



to Massachusetts. Pennsylvania and \\i 



