STIPEAE PLATENSES 59 



arista persistens tenuis flosculo (3-10-plo longior. Culmi eiati 

 graciles, folia planiuscula non v. vix scaberula superantcs; pa- 

 nicula ampla relaxata nutans . 



Hah . Frequens in campis editioribus per totam planitiem pam- 

 parum, a Bahia Blanca ad Tueuman usque, per ann. 1882-1900. 



Obs . Perennis laxe subcaespitosa herbacea viridis . 



Culmi in quoque caespite numerosi, folia saepius longe supcriin- 

 tes (250-1200 mm alt. = l-2 mm crass.) laxe remoteciue v. dense 

 apicem usque foliati, late fistulosi erecti recti v. basi geniculati, 

 ibique saepe subverticillatim ramosi radicantesque, glaberrimi lae- 

 vissimi e virescenti subglaucescentes, nodis incrassatulis fusculis 

 glabris . 



Folia, omnia isomorpha, radicalia caespitosa erecta, culmigena 

 laxa patula, herbacea moliia v. vix subrigidula viridia non v. lc- 

 nissime glaucescentia, hmbis sub jove pluvio planis, in sicco ca- 

 naliculatis v. plus minusve involutis (50-300 mm long.=:2-5 mm 

 lat.) sursum sensim angustatis apiceque subulato-callosis sed non 

 pungentibus glabris v. vix obsolete scaberulis, utrimque tenuiter 

 denseque longitrorsum striato-costulatis, vaginis pallidioribus, in- 

 flmis relaxatis, culmigenis adpressis glabris sublaevibus, ore trun- 

 catis, auriculis glabris v. parcissime ciliolato-barbatis, ligulis an- 

 guste marginiformibus truncatis scariosulis glabris, acie denticu- 

 lato - erosis . 



Infloreseentia primo erecta v. vix secunda angusta subspicata 

 (100-250 mm long.^5-15 mm diam.), plus minusve arcte vagina 

 folii supremi parum intlata inclusa, dein longe exerta exharata 

 patens nutans, rachi vix angulosa laevi, ramis et pedicellis d-lO 

 mm long.) gracillimis anguloso-compressulis minute e scabrido 

 pubescentibus, summo apice obsolete incrassatuHs. 



