STIPEAE PLATENSES 155 



sillo (0,~!0-0,25 mm long.) obconico acuto dense adprcsse breviu- 

 sculeque albo-villoso. 



Arista leniter e.\.centrica tenuissima praelonga persistens (48-88 

 mm long.) nuda scabrido-papillosa 1 (an 2?)-geniculata, geniculo 

 manifeslo ad tertium infcrum sito. Articulatio glumellae cum arista 

 vix perspicua. 



Corona vera nulla sed umbonulus glumellae subcylindraceus (0,15 

 mm long.) acie saepius minute densiusculeque ciliolatus. 



Varietates v. formae sequentcs facile distinguendae: 



a) oreophila Speg.: caespitibus contractis, foliis rigidis pungen- 

 tissimis, paniculis folia non superantibus patulis, glumis majoribus 

 (8-11 mm long.) violascentibus, fiosculis (3 mm long.) magis sca- 

 bris. In collinis et montuosis occurrens. 



b) planieola Speg.: caespitibus laxioribus, foliis minus rigidis, 

 non V. vix pungentibus, paniculis saepius longe exertis contractis, 

 glumis minoribus (5-9 mm long.), flosculis (2-2,5 mm long.) vix 

 scabro-rugulosis. In planitie vegetans. 



Specimina inspecta sunt: 



a/ Ex rupestribus Sierra Ventana, Nov. 1895 (C. S.). 

 b/ En pratis secus Rio Negro et Rio Colorado, Febr. 1898 

 (C. S.). 



e/ Ex pratis prope Sierra CurdmalcU, Dec. 1899 (C. S.). 



dl Ex pratis prope Cdrdoba, aest. 1887-99 (C. S., T. Stuckcrt), 



e/ Ex campis prope Mendo;:a, Jan. 1896 (C. S.). 



// Ex campis prope San Jaan^ Apr. 1897 (C. S.). 



Ol Ex aridis prope Mendo^a, Fcbr. 1901 (C. S.). 



