GRAMINEAE. 



Vol. I. 



5. Sporobolus Drummondii (Tr'in.) Vasey. 

 Drummond's Rush-grass. Fig. 468. 



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

 VI. S 2 : 106. 1840. 



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



Culms ii°-3° tall, erect, slender; leaf-blades i" 

 long or less, i"-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 i}4" long. 



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



Agrostis aspera Michx. Fl. Bor. Am. 1 : 52. 1803. 

 Agrostis longifolia Torr. Fl. U. S. 1 : 90. 1824. 

 5". asper Kunth. Rev. Gram. 1 : 68. 1829. 

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



Culms i4°-3i° .tall, erect, simple or occasionally 

 branched, smooth and glabrous. Sheaths shorter 

 than the internodes ; ligule very short, minutely 

 ciliate; leaves 4/-18' long, i"-a" 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 l'-2' long, erect; spikelets 2j"-3" 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 internodes, 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 a'-3' in length, in- 

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

 erect ; spikelets 2i" 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. 



