Tab. i42. TRISETUM Bekteroaaum. 



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Culmis erectis, simplicibus vaginisque glabris; foliis angustissimis, planis, in- 

 terne margineque scabriusculis^ ligula elongata 5 panicula simplici ; ramis geminis- 

 terms, erectis, scabris^ spiculis subtrifloris: floribus monandris, terminali ad 



pedicellum sericeum redacto 5 glumis subaequalibus , flores basi sericeo-barbatos 

 superantibus^ arista basilari, medio geniculata. 



Crescit in regno Chilensi. o. 



Radices filiformes, simplices, villosae. Culmi caespitosl, erecti, simplices, adjecta panicula 

 9-10-polIicares, teretes, glabri- nodls imberblbus. Folia angustissime linearia, plana, nervoso- 

 strlata, externe glabra, interne marglneque scabrluscula , membranacea, 1 f-i J-polllcarla^ 



summum 2 j-poUIcare. Vaginae us^e ad baslm fissae, strlato-angulatae, glabrae, inleniodlis 

 brevlores, subpollicares, summa 2 J-3-polIicaris , basim paniculoe involvens. Llgula elon- 

 gata, lanceolata, acuta, tenulter membranacea, integra, glabra, duas lincas longa. Panicula 

 erecta, simplex, 4-5-pollicarIs ; ramls geminis vcl tcrnis, crecto-adprossls, remotls, capillaceis, 

 virescentibus vel purpurascentlbus rhachique scnhrls. Spirnloe spnrsae, pedicellatx^ sublrlflorDe , 

 duas lineas longae. Fiores dlstantes, distlchi, summus ad putllcclluui sericeo-pilosinii rcdactus; 

 rhachis spiculae subflexuosa, pilis albldis sericeis rlgidis densc obsita, Gluma; duoc, subxcjuales, 

 lanceolatae, obtusae, carlnatae, dorso trlnerviae, herbaceae, vlrlrles, superne vlolasccntcs, mar- 

 gine hyalinae, flores superantes; nervis praesertira intermcdio scabrls, apice evanescentlbus. 

 Paleae duaej inferior oblonga, membranacea, hyallna, aplce irregulariter qnincjuefida , laciniis 

 acutatis, duabus extlmls multo longloribus, inferne palHde violascentibus, qnachinervia, nervls 

 utrinque evanescentibus, supra basimlonge aristata, exlerne scabrluscula , ad basim exteriorem 

 pilis longis albis rlgidis serlcels obsitaj arista paleam longiludlne duplo superans, scabriuscula , 

 infra medium geniculata, Inferne fusca, levlter torta, superne recta, albida. Palea supcrlor 

 i brevior, oblonga, apice bifida, binervla, blcarlnata, hyallno-membranacea, carinis hispldulo- 

 scabrls. Squamulae ovatae, integrae, carnosb-membranaceae, glabrae. Stamen solitarlum, hypo- 

 gynum, anticum. Filamentum capIUaceum , glabrum. Anthera parva, basi aiTixa, fere usque ad 

 basim bifida, lobis oblongis obtusis, flavida, glabra. Ovarlimi parvum, obllqiie obovato- 

 oblongum, glabrum. Stigmata duo, subsessilia, tennlnalia, plumosa, albida; pllis slmplicibus, 

 hyalinis. Caryopsis oblique oblonga , obtusa, lateribus compressluscula , supra basim breviler 

 stlpitata, laevis, fusca, glabra, libcra, paleis obtecta. Albumen farinaceum, album. Embryo 

 basilarls, anticus, semine quadruplo brevior. 



Ce nouveau Trisetum a la plus grande afUnite avec deux esp^ces eui op^enncs, les Triselum 

 flavescens et tenue. Je lul ai donne le nom de M. Bertero, qui Fa d^couvert au Chili et Ta 



immumque 



/ \ 



amis d'Europe 



