EKMAN, NEUE BRASILIANISCHE GRASER. 23 
Tribus Agrostide&. 
Aristida marginalis n. sp. 
Tafel 3, Fig. 2; Tafel 6, Fig. 12. 
Perennis. Culmi stricte erecti, graciles, ad 12 dm alti, 
inferne 1,5 mm crassi, subcompressi vel superne teretes, sim- 
pliees vel raro parum ramosi, multi- (sepe 11-) nodes, nodis 
culmi medii crebris, internodiis hic 2—3 cm tantum longis, 
summis creberrimis, internodiis igitur brevissimis, ut folia 
summa 2—3 eodem loco inserta videant. Foliorum vaginze 
arcte, saltem basales subcompresse, striate, leves, glaber- 
rimas, internodiis culmi partis inferioris longiores vel iisdem 
equilong, iis partis medie subduplo breviores, summis valde 
longiores; ore barbato; ligula truncata, brevissima, ciliata; 
laminze lineares, e basi lata sensim acutissime acutate, ad 
25 cm long, basi 3 mm late, plane, novelle tantum sicci- 
tate convolut&, glaucescentes, supra scabr&, subtus leves, 
glaberrime, crassinerves, utroque latere nervis 6 —7 subconti- 
guis percurse, nervo marginali valde prominenti, crassissimo, 
cartilagineo, stramineo. Panicula oblongo-lanceolata, ad 22 cm 
longa, 6 cm lata, densiuscula, sat parvi- sed multiflora, rhachi 
striato-angulata, scabra, glabra, ramis ternis, eodem loco in- 
sertis (potius: ramis singulis, ad ipsissimam basin in tribus 
divisis) vel superne binis (ramo altero laterali haud evoluta), 
ramo intermedio trium ad 10 cm longo, usque ad medium 
indiviso, supra eam in ramulis spiculigeris ad basin divisis 
inequilongis soluto, ramis trium lateralibus modo rami inter- 
medii ad basin vel paulo supra eam ramulosis, ramis ramulis- 
que subangulatis, scaberulis. Spicule singule, nunc longius, 
nune breviter pedicellate, pedicellis seaberulis, apice vix ullo 
vel obsolete incrassatis, in ramulis equaliter disposite, erectae, 
contiguz, lanceolato-lineares, sine aristis 5—6 mm long, vio- 
lace, sspe ex parte stramines, quo panicula multicolor 
videtur. Gluma I. lineari-lanceolata, 4,» mm longa, 1 mm 
lata, obtusiuseula, aristulata, arista scabra 1,5 mm longa, 
membranacea, membrana sub lente forte pellucido-punctata, 
uninervis, nervo extus scabro, violacea, margine pallidior, 
straminea, metallico-nitens; gluma II. I" squans, in aristam 
