240. 
MUSEO NACIONAL DE BUENOS AIRES. 
tibus, omnibus glabris striatis pallidioribus, limbis planis 
(in sicco convolutis), glabris striatis margine scaberulis, 
pilis adpressis laxissime adspersis viridibus, ligulis bre- 
vissimis marginiformibus truncatis denuculatis; culmi tere- 
tes, ad apicem usque vaginati striatuli, deorsum 2-nodosi, 
sursum continui dense scabrido-striatuli, rigiduli abbreviati 
(25-30 cm long.); panicula erecta contracto-spicaeformis 
linearis (5-6 em long., 5-8mm diam.) apice obtuse rotunda- 
ta, basi attenuata, compacta, non lobata, radiis brevissi- 
mis congestis, ramululis subangulosis scabridis, basi mar- 
gine calloso strictissimo obtuso subobliquo rachidem am- 
plectente donatis; spiculae confertae, lanceolatae (2,5-4 mm 
long.) acutiusculae flavidae glabrae 1-florae, rudimento 
floris secundi destitutae, glumis subaequalibus, infera 3- 
nervia, supera 1-nervia, convexulis, dorso non carinatis v. 
vix sub apice, acutiusculis, margine subdenticulatis, laevi- 
bus nitentibus, ad nervos scabriusculis; flos lanceolatus 
acutiusculus, glumis conspicue brevior (2,5-3 mm long.), 
basi pilis longis hyalinis simplicibus (0,5-2 mm long.) laxe 
cinctus, valvula infera 3-nervia, deorsum et margine sca- 
briuscula, ad medium aristulata, apice acuta subbifida hya- 
lina, valvula supera lineari vix breviore; arista tenuissima 
recta minutissima, valvulam ipsam vix superante, scabrida. 
Calamagrostis suka Speg. (n. sp.).—Tab. 4, f. B. 
Diag. Caespitosa glabra, foliis plicatulis, culmo glaberrimo 
erecto ad medium usque vaginato valde brevioribus, ligula 
longiuscula truncata pectinmato-dentata, pamicula angusta se- 
cunda subnutante laxiflora, rachide glabra, radis ramulosis 
gracillimis, spiculis lanceolatis compressis, glumis aequilongis 
margine et ad nervos scabriusculis. 1-floris, rudimento nullo, 
Aore villis ipsum aeqguantibus densiusculis cincto, valvula 
infera sub apice aristulata. 
Hab. Rarissima in scopulosis maritimis: Brecknok Pass; 
Basket Isl.; Shámmalkus. 
Obs. Species pulcherrima distinctissima, peremnis, radi- 
cibus caespitosis laxe comosis; folia rigida glabra striatula 
culmis pluries breviora (5-10 cm long.) vaginis inferis re- 
laxatis brevibus, superis elongatis arcte amplectentibus, 
omnibus glabris pallidis striatis, limbis plicatis y, convo- 
lutis viridibus rigidulis rectis apice acutis striatis glaber- 
rimis, ligulis longiusculis submembranaceis rigidulis su- 
