AiMtOSTlDE.M. 293 



roi>e8, which, howovor, i\o not lust Ion . Of little value forgmzing 

 except when young und lender. 



15. 8. Jonesii Vasey. Coult. Itot. (iaz. 0:"2{>r (18SI). 



A densely tufted, erect slender j»erennial, ;i()-40 cm. Iiigli; culm 

 8olid as in Maize. Sheaths seahroiis, S-12 cm. long; ligulo ',i~i ?nni. 

 long; blades of sterile siioots numerous, rigid, involute, excejjt the 

 lowest, whieli are flat, G-10 cm. long, those of the culm 1 or "Z in 

 number, setaceous, '^-.'5 cm. long. Panicle much e.xserted, erect, 

 thin, elliptical, 5-8 cm. long, rays solitary, the lowest and longest 

 ti-;{ cm. long. Spikelets streaked with light purple: empty glunu'S 

 broad, sube(|ual, 1-iierveil, about I mm. long, tirst obtuse, narrower 

 and a litth; shorter, second Iruncate-erose: lloral glume scabrous 

 and slightly pubescetit, 2.'.i-'-\.7 mm. long, ovate, acute, 3-nerved, 

 tlui lateral nerves obscure: palea scabrous, as wide and nearly as 

 long as its glume, elliptical, harilly acute when spread. 



<'aIifoniia (Soda Springs), Jones. 



10. S. vaginaeflorus (Torr.) Vasey, Cat. Cr. V. S. V) (1885). 

 VUfa raf/itta'l!(ini Torr., A. (iray, (Jram. et. Cyp. l:n. 15 (1834). 

 Agrosds Viryiniiti Muiil. (iram. 74 (1817) iiot li. 



A slender much-bninclied ascending annual, 15-IJO cm. liigh. 

 Sheaths one-half to one-third as long as the internodes. most of 

 them swollen, each with a lateral spikelike panicle; blades involute, 

 slender, scabrid, 3-10 em. long, those of the culm about 7 in num- 

 ber. Pani(!les entirely or partially enclosed by the sheaths, 1.5-4 

 cm. long. Empty glumes keeled, 1-nerved, acute, subequal, 2-3 mm. 

 long; floral glume and palea (the former 3-uerved, lateral nerves 

 obscure), pubescent with short hairs as seen under a lens, acute, 2.7 

 mm. long. The spikelets in the termiiuil spikes are longest and 

 often sterile. Grain oval, about 2 mm. long. 



Pennsylvania, F. S. Dept. AgricuJ. 374, from Scribner; Michigan, 

 Clark 2639; Cooley, Heal. 



Barren soil from Maine to Texas. 



17. S. gracillimus (Thurb.) Vasey, Bull. Torr. Club, 9:103 

 (1882). Vilfagranllinia Thurb. S. Wats. Bot. Calif. 2:268(1880). 



A densely tufted annual, 7-15-30 cm. high. Sheaths about as 

 long as the internodes, loose, witli hyaline margins; ligule obtuse, 



