250. 
SPEGAZZINI: PLANTAE PER FUEGIAM COLL. 87 
perne truncatis dense pectinato-denticulatis; culmi graciles 
e basi arquata adscendentes erecti (40-60 cm long.) glaberri- 
mi laevissimi graciles, deorsum 2-nodosi, nodis glabris 
fuscis vix incrassatulis, ad medium usque vaginati, caeterum 
nudi; panicula subspicata ramulosa secunda v. nutans 
flavescens nitens, rachide tenui subflexuosa radiisque gra- 
cillimis elongatulis laevissimis glaberrimis fere a basi laxis- 
sime spiculigeris; spiculae erectae v. subcernuae lanceolatae 
(6 mm long.) compressulae acutae glaberrimae nitentes, 
1-florae, rudimento floris secundi destitutae, elumis subaequi- 
longis lanceolatis acutis non v. vix ad apicem carinatulis, 
ubique dorso margineque scabriusculis, subpellucidis niten- 
tibus, infera 3-nervia, supera 1-nervia; flos ovatus obtusus, 
elumis conspicue brevior (3-3,5 mm long.), basi villis sim- 
plicibus rectis, ipsum aequantibus v. superantibus (4 mm 
long.) copiosis pallescentibus cinctus, valvula infera hyalina 
5-nervia, ad nervos dorsi scabriuscula, superne bifida obtu- 
siuscula, supra medium aristulata, supera lanceolata bre- 
viore apice acuta fimbriatula; arista recta rigidula glumas 
- subaequans. 
Deyeuxia treticola Speg. (n. sp.). 
Diag. Achaeta, caespitoso-repens, pusilla; culmi arquato-ad- 
scendentes graciles, ad apicem fere usque vaginati, folia bre- 
via plana glabra, ligula brevi subtruncata, panicula par- 
vula spicaeformis pauciflora; spiculae minutae virides 1-flo- 
rae, racheola elongatula, rudimento floris secundi coronata, 
adrdita; glumae subaequales latiusculae subcarinatae acutiu- 
sculae, imfera subbreviore 1-nervia, supera 3-nervia, glabrae, 
vix dorso infra apicem scaberulae; flos hermaphroditus sessilis 
vix glumas superans, valvula infera apice obtuse denticulata, 
dorso ad basin minute puberula, superam nonnihal longiorem 
amplectente, racheola terete scabriuscula erecta squamulam 
hyalinam pusillam sustinente. 
Hab. Non rara ad marginem piscinarum in sabulosis: 
Punta Anegada. > 
Obs. Perennis, repens, espe folia radicalia 
pauca, culmigenis simillima, vaginis plus minusve amplecten- 
tibus pallidis glabris striatis, limbis erectiusculis v. paten- 
tibus breviusculis (20-30 mm long., 2-3 mm lat.) planis v. 
subplicatis, apice abruptiuscule obtuseque acutatis, viridi- 
bus glabris striatis, ligulis breviusculis (1 mm long.) rotun- 
