269. 
MUSEO NACIONAL DE BUENOS AIRES. 
giore, floribus remotiusculis, vix basi subpubescentibus laevis- 
simis ovato-obtusis, valvula infera obovata 5-nervia. 
Hab. In piscinis et ad margines rivulorum non rara: Pun- 
ta Arenas; Sarmiento Fjord; landagáia. 
Obs. Species, habitu praecipue, G. Auitantis KR. Br. affinis. 
Annua?, repens, ad nodos fibris paucis filiformibus subcir- 
rhosis ornata; folia glaberrima laevissima erecta v. subflui- 
tantia, culmos et paniculam ad apicem usque involventia, 
vaginis ampliatis amplectentibus pallidis, inferis breviuscu- 
lis (5 cm long.) superis elongatis (10-15 cm long.) striatulis; 
limbis planis concaviusculo-carinatis, extus viridibus intus 
viridi-glaucescentibus, eximie minuteque striatis, apice sen- 
sim attenuatis atque acutatis, saepius breviusculis (5-10 
cm  long., 3-5 mm lat.) erectis v. patulis, ligulis elonga- 
tulis (2-25 mm long.) late ovato-triangularibus hyalinis 
denticulato-fissis; culmi toti vaginati, arquato-adscenden- 
tes subflaceidi (25-50 cm long.); panicula diu vagina su- 
prema subspathiformi inclusa dein e latere exerta plus 
minusve elongata (15-25 em long.) primo linearis stricta, 
dein patula expansa laxiflora, rachide acute angulosa gra- 
cili vix scaberula, radiis remotis alterne paucifasciculatis, 
deorsum nudis, sursum ramulosis paucispiculigeris, angu- 
losis non v. vix scabriusculis, pedicellis brevibus superne 
sensim incrassatulis atque subobconico-triquetris scaberulis; 
spiculae lineares tereti-compressulae (5,5-6 mm long., 1- 
1,5 mm diam. ) glaberrimae laevissimae, viridi-glaucescen- 
tes, 3-florae erectae v. subnutantes, glumis tenuibus glaber- 
rimis Ovatis non Carinatis apice obtusis, infera breviore 
(1 mm long.) apice rotundata et subdenticulata, supera 
duplo longiore (2 mm long.) lanceolata apice truncato-den- 
ticulata, floribus remotiusculis ovatis obtusis (2,5-3mm long.) 
superne glaberrimis laevissimis basi non v. laxissime sub- 
pubescentibus, racheolis tenuibus glabris laevibus, valvu- 
lis subaequilongis, infera obovata 5-nervia apice late sub- 
triangulari-rotundata atque denticulato-fimbriata, inferam 
angustam lanceolatam, margine denticulato-scabridam sub- 
aequilongam apice erosulam arcte amplectente. 
Glyceria antarctica Speg. (n. sp.). 
Diag. Repens, arquato-adscendens viridis glaberrima, folúis 
paucis subplanis rigidulis inferis fluitantibus, vaginis la- 
aiusculis, ligula elongata-triangulari denticulata; culmi erecti- 
