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TaB. 121. STIPA TRIGHOTOMA. 



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Culmis caespitosis^ foliis convoluto-setaceis, rigidis, scabris^ panicula ramosa, 

 erecta, secunda^ ramis ramulisque geminis vel ternis, scabris^ spiculis sparsis, 

 longe pedicellatisj glumis subsequalibus, superne angustatis, trinerviis, purpuras- 

 centi-fuscis , ad nervos hispidulis^ florem duplo superantibus^ palea inferiore tu- 

 berculato-spinulosa/ scabrataj arista hispido-scabra, inferne leviter torta, glumas 



sextuplo superante. 



Stipa trichotoma Nees ab EsenbecJc flor. BrasiL 2. jp. SjS. Trin, inAct,Petrop, 



183 o, i,p, yS, 



rescit ad Monte Video. % 



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Radix repens, fibras albas emittens. Gulmi crebri, denslsslme fasciculato-caespitosi, simplices, 

 erecti, filiformes, teretes, striatuli, glabri, inferne tri-vel ^uadrinodes , adjecta panicula subses- 

 quipedalesj nodis obsoletis, glabris. Folia angustissimc linearia, convoluto-setacea, strictius- 

 cula, rigida, scabra, septem-vel octopoUicaria. Vaginae tercliuscula? , membranaceae, striatae, 

 elabrae, usque ad basim fissa^, internodia parum superantes. Ligula obliqua, elongata, obtusa^ 

 integra, subchartacea, glabra. Panicula erecta, subsecunda, ramosa, sex-vel octopollicaris ; ra- 

 mis ramulis(iue filiformibus, elongatis, geminis vel ternis, angulatis, scabris; rhachi stricta, tenui, 

 hinc convexa, inde planiuscula, angulis hispidulo-scabra. Bracteolae ad basim infimi vel duorum 

 infimorum parlum ramorum duae, interdum unica, parvae, lanceolat^e, membranaceae^ hispi- 

 dulae. Spiculae sohtariae, sparsae, longe pedicellatae ^ pedicellis filiformibus, angulatis, scabris, 

 sub flore calloso-incrassatis. Glumae duae, subaeqiiales, oblongo-lanceolatae , superne angustatae, 

 carinatae trinervise, nervis lateralibus superne evanescentibus , purpurascenti-fuscae , apicem 

 versus hyalino-albidae , patulae, duaslineas longaej inferior nervis margineque hispida ; superlor 

 interdum brevior, nonnisi ad nervos hispldula. Flos sessilis, basi barbatus ibique articulatus, 

 obhque obovatus , lateribus compresslusculus, glumis dimidio brevlor, fuscescens; pilis albido- 

 areentels flore dimidio brevioribus, adpressls. Paleae duae, valde inaeq;uales; inferlor latissima, 

 conduplicato-convoluta , marginibus sibi mutuo arcte incumbentlbus, chartacea, quin^ener- 

 via , tuberculis minutissimis spinulaeformlbus scabrata , stramineo-fuscescens, apice aristata j 

 arista filiformi-setacea, inferne spiraliter torta, hispido-scabra, pollicaris velbrevior, basi arti- 

 culata. Palea superior dimidio brevior, inclusa, oblonga, aplce obsolete dentata, subconcava, 

 glabra hyaUna. Genitalia haud vidi. Caryopsls paleis arcte obtecta, oblique obovato-turbinata, 

 lateribus compressluscula , apice oblique truncata, basi stylorum aplcata, laete fuscescens, stria- 

 tula elabra, opaca, libera. Pericarplum tenuiter membranaceum , semini adnatum. Albumen 

 album farinaceum. Embryo minutus, basi albuminis obUqtie applicatus, paleam inferiorem 

 spectans, albus. Corculum obli^e abbrevlato-conicum, cotyledoni elliptico insidens, superne 

 solutum et diphyllum; foliolis cotyledoni contrariis, gemmulam minutissimam amplectentibus. 



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