GRAMINEAE 



VOL. I. 



5. Sporobolus Drummondii (Trin.) Vasey. 

 Drummond's Rush-grass. Fig. 468. 



Vilfa Drummondii Trin. Mem. Acad. St. Petersb. 

 VI. 5 2 : 106. 1840. 



S, Drummondii Vasey, Cat. Grasses U. S. 44. 1885. 



Culms i$-3 tall, erect, slender; leaf-blades i 

 long or less, l"-ii" wide, attenuate and filiform at 

 the apex; panicle 4'-6' long, slender; spikelets 

 about 2" long, the empty scales acute, the first 

 shorter than the second, the flowering scale gla- 

 brous, acute or obtusish, longer than the second 

 one and about equalling the acutish palet. 



In dry soil, Missouri to Louisiana and Texas. 

 Sept.-Oct. 



Sporobolus attenuatus Nash has been reported as 

 introduced along railroads in Jackson Co., Mo. It is 

 related to the above and may be distinguished by its 

 smaller spikelets about iH" long. 



6. Sporobolus asper (Michx.) Kunth. Long-leaved Rush-grass. Fig. 469. 



Agrostis aspera Michx. Fl. Bor. Am. i : 52. 1803. 

 Agrostis longifolia Torr. Fl. U. S. i : 90. 1824. 

 .S. asper Kunth. Rev. Gram, i : 68. 1829. 

 S. longifolius Wood, Class-book, 775. 1861. 



Culms ii-3$ tall, erect, simple or occasionally 

 branched, smooth and glabrous. Sheaths shorter 

 than the internodes ; ligule very short, minutely 

 ciliate; leaves 4'-i8' long, i"-2" wide at the base, 

 attenuate into a long slender involute tip, smooth 

 and glabrous beneath, scabrous and hairy at the 

 base above ; panicle more or less included in the 

 upper sheath, 3'-io' in length, linear, strict, the 

 branches i'-2' long, erect; spikelets 2\"-$' long; 

 outer scales unequal, acutish, glabrous, the lower 

 shorter ; third scale glabrous, acutish or obtuse, ex- 

 ceeding the second and equalling or a little shorter 

 than the obtuse palet. 



In dry soil, Maine to South Dakota and Texas. 

 Prairie-grass. Aug.-Sept. 



7. Sporobolus pilosus Vasey. Hairy Rush- 

 grass. Fig. 470. 



Sporobolus pilosus Vasey, Coult. Bot. Gaz. 16 : 26. 1891. 



Culms i-ii tall, erect, rigid, stout, smooth and gla- 

 brous. Sheaths shorter than the intei nodes, crowded 

 and overlapping at the base of the culm ; ligule very 

 short, minutely ciliate ; blades 3'-6' long, i"-2" wide at 

 base, erect, rigid, attenuate into a slender involute tip, 

 the lower papillose-hirsute on both sides, the upper 

 usually glabrous beneath, scabrous above and some- 

 what hairy near the base; panicle 2'-3' in length, in- 

 cluded at the base, erect, strict, its branches i'-i' long, 

 erect ; spikelets 2!" long, the outer scales unequal, gla- 

 brous, obtuse, the lower shorter; third scale obtuse, 

 glabrous, somewhat exceeding the second and equalling 

 or a little longer than the obtuse palet. 



In dry soil, Kansas and Missouri. Aug.-Sept. 



