1 90 GRAMINEAE. 



7. Eragrostis sessilispica Buckle}^. Prairie Eragrostis. (Fig. 434.) 



Eragrostis sessilispica Buckley, Proc. Acad. Phila. 1862: 

 97. 1862. 



Diplachne rigida Vasey, Grasses S. W., Part 2. pi. 41. 

 1891. 



Culms 8'-3^ tall, erect, simple, smooth and gla- 

 brous. Sheaths short, crowded at the base of the 

 culm, smooth, pilose at the summit; ligule a ring of 

 short hairs; leaves 2 / -6 / long, %"-\W wide, rough 

 above, glabrous or sparingly pilose beneath; panicle 

 S'-iS' in length, the branches stout, rigid, widely 

 diverging; spikelets scattered, closely sessile, ap- 

 pressed, 5-12-flowered, 4 // -7 // long, empty scales 

 about equal in length, acute; flowering scales very 

 acute, about 2" long, the lateral nerves very prominent. 



Prairies, Kansas to Texas. Aug. -Sept. 





8. Eragrostis curtipedicellata Buckley. 

 Short-stalked Eragrostis. (Fig. 435.) . 



Eragrostis curtipedicellata Buckley, Proc. Acad. Phila. 

 1862: 97. 1862. 



Culms 6'-$ tall, erect, rigid, simple, smooth and 

 glabrous. Sheaths overlapping, smooth, pilose at the 

 summit; ligule a ring of short hairs; leaves 2 / -8 / long, 

 i "-2" wide, smooth beneath, scabrous above; panicle 

 4 / -i2 / in length, the branches widely spreading, 1%'- 

 4%' long; spikelets 5-i2-flowered, i}4 // -3 // long, on 

 pedicels of less than their own length; scales acute, the 

 empty ones somewhat unequal, the flowering ones 

 about % ff long, scabrous on the midnerve, their lateral 

 nerves prominent. 



Prairies, Kansas to Texas. Aug.-Sept. 



9. Eragrostis pectinacea (Michx.) Steud. Purple Eragrostis. (Fig. 436.) 



Poa pectinacea Michx. Fl. Bor. Am. i: 69. 1803. 

 Eragrostis pectinacea Steud. Syn. PI. Gram. 272. 

 Eragrostis pectinacea var. spectabilis A. Grav, Man. 

 Ed. 5, 632. 1867. 



Culms i-2}4 tall, erect or ascending, rigid, 

 simple, smooth and glabrous. Sheaths overlapping, 

 smooth, glabrous or villous, the upper one often 

 enclosing the base of the panicle; ligule a ring of 

 hairs; leaves 5 / -i2 / long, 2 // -4 // wide, smooth be- 

 neath, scabrous above and sparingly villous at the 

 base; panicle 6 / -24 / in length, purple or purplish, 

 the branches 3 / -io / long, strongly bearded in the 

 axils, widely spreading or the lower often reflexed; 

 spikelets 5-is-flowered, \ l /z ff -\' f long, on pedicels 

 of at least their own length; scales acute, the empty 

 ones about equal, the flowering ones about fa ft 

 long, their lateral nerves very prominent. , 



In dry soil, Massachusetts to Illinois and South 

 Dakota, south to Florida and Texas. Aug.-Sept. 



