198 MUSEO XACIOXAL DE BUENOS AIEES. 



mm long.) parum latiore; flosculi saepius bini, infero sessili^ 

 supero racheola gracili glaberrima brevi (1 mm long.) fiilto, 

 basi ciliis brevibus (1-1.5 mm long.) tenuibus albis subpap- 

 pose cinctis, glumellis inferís (6,5-7 mm long.) carinatis ad 

 carinam scabris, lateribus cíense pnlverulentis 5-nervibns, 

 ñervo mediano in mncronnlo brevissimo exeurrente, glumellis 

 superis brevioribus (-1,5-5 mmlong.) angustis liyalinis 2- ca- 

 rinatis glabris v. pulverulento -subpnberulis ápice acutis inte- 

 gris V. vix subbidentatis, marginibus introflexis genitalia, 

 amplectentibus. Flosculus superus saepe raclieola tenuissima 

 floris tertii omnino abortivi ornatus. 



Specimina quae milii adsunt omnia foeminea, 

 J 701:. Poa eriuacea Speg., n. sp. 



Diag. Herinaphrodita v. jjolygania, deiisissime caespitosa, 

 fasciculis sterilibus et fertílibus in stolonihus saepius confertis- 

 sime monostiche inibricatis, ómnibus isomorphis^ foliis saepius 

 distichis glaherrimis, vaginis latissimi.s arete vaginantilAis pal- 

 lidis nitidis ápice minute hiauricidatis, Umhis recte v. arcuatim 

 patentibus subtereti- suhulatis brevibiis rigidissimis in mucrone 

 acutissimo pungentissimo tenninatis, Jigulis nuUis v. vix evolutis 

 scariosis, culmis laevibus erectis gracilibus simpUcibus nudis v. 

 1-foliatis, spica strictissima erecta seciínda, nodis2-3-pedicelU- 

 geris, pedicellis scabridis brevibus v. brevissimis, spiculis strami- 

 neis coriaceis nitidis compressis lanceolatis saepius 2-floris, 

 floscidis glaberrimis, inferis saepius hermapliroditis, superis 

 masculis, glumis glumeUisque exaristatis acutiuscidis. 



Hab. In aridissimis subsalsis secus Rio Cliubut, Dec. 189í> 

 (X. lllinj. 



Obs. Species DisticMi scopariae (Kntli) Arech, habitu sat 

 similis, humillima, caespites pulviniformes subliemisphaericos 

 (10-25 cm diam. = 5-7 cm crass.) saepius compactissimos 

 pungentissimos efficiens. Stolones subdichotome ramosi (1-2 

 mm crass.) deorsum saepius denudati v. squarrosi, sursum in 

 linea infera submonosticlie confertiusculeque (fere subpecti- 

 natim) radicantes, radicibus crassiuíículis simplicibus rigidis, 

 in linea supera oblique densissimeque imbricato-vaginati; 

 fasciculi steriles numerosi et fértiles ]3auci commixti, omnes 

 intravaginales monostichi v. obscure subdistichi, centrales 

 constijjatissimi marginales ±. ve relaxati. Folia saepius ma- 

 nifesté disticha, vaginis subinflatis scarioso - membranaceis 

 (30-50 mm long, = 5-8 mm lat. aprt.), glaberrimis nitentiu- 



