AuuosTiin:.!-:. 217 



first oval, lUiute, hccoiuI imrrower; lloral jjliimo about I luui. lonjj, 

 iiii'ludinj; tho very abort curved biwc, dolbetl witb very sbort 

 hairs; uwn twice l)eut, 10-15 mm. long. 



Mexieo, /'ritif/li' 4*,'-.M). 



Mountain meadows. 



7. S. tenuissima Trill. Midi S(!. A<ad. St. Pctersb. 1 : cr (Ks:5()). 



Culms very sleiuh-r, »!()-.S(i em. bi^,'b. Sbeatbs sliorti-r tban tbe 

 iiiteniodes; ligule '-,'— i mm. long; bbides scalirid. lilit'orm. involute, 

 about (•..'» jum. dium. even near the l)ase, sonu' of tbe b'jives usidgli 

 u.s tbe culm. Paidelo more or less iiu luded. very slender, inter- 

 rupted, 15-:i() cm. long; rays in threes, lours, or lives, sonu' almost 

 sessile, tho largest 4 em. long. Kmpty glumes lanei'-acuminate, 

 witb bristle-like points, thin, white, tinged witb jturple, :5-nerved 

 near tbe base, first 5-S mm. long, or tbe liristie sometinus making 

 it •■>0 mm. long, second about 5 mm. long; lloret scabrid. 'I mm. 

 long, including tbe abruptly-pointed hairy callus, a short (;rown of 

 hairs at tbe apex; awn 7-H cm. long, ().•,* mm. or less iliam., with 

 one bend a third of tbe distani-e from the l)ase. 



West Texas, llamrd, litivklcy; New Mexico, Wriyht, llMiO; 

 Mexico, Prinijlc \Vl'!\. 



Western Texas, New Mexico and Arizoiui. 



vS. S. Jarava lieauv. Agrost. 1!) (ISl-,'). S.eriosfdvhua If. li. K. 

 Nov. Gen. ot Sp. 1: irJr (1S15). S. Ic/tu Kunlh, Rev. (iram. 1 : GO 

 (IS-.'!.). 



A tufted erect perennial. Culms (50-180 cm. high, nodes 4-5 

 in number. Blades of sterile shoots involute, -iO-fiO cm. or more 

 long, 0.5-0.7 mm. diam. Sheaths of the culm longer than the 

 internodes (or shorter in tall i)lants). scabrous; ligulo oblicpie, 

 o])tuse. '^ mm. long; blades involute, scabrous on tbe uiuler side, 

 l-".* mm. diimi. Panicle but little exserted, contracted, i)ale 

 puri)lish green, IJ()-40 cm. long; rays in threes and fours, the long- 

 est 10 cm. or more long, branching aiul bearing numerous spike- 

 lets from a little above the base. Empty glumes subetpud, nar- 

 rowly lanceolate, delicate. U-7 mm. long, 3-nerved, tbe upper 

 sometimes 1-nerved ; lloral glume linear, 3 mm. long, clothed with 

 short appressed hairs, the apex bearing a tuft of liairs as long as 



