Tab. i4i. TRISTAGHYA chrysothrix. 



■ r 



Diandra^ gluma inferiore tuberculata, fulvo-hirsuta. 



Tristachja chrysothrix Nees ab Esenb, Agrostogr. BrasiL p. 46o 



Crescit in Brasilia. if. 



Gramen caespitosum . Radices teretes, vermiculari-suhtortuosae , ramosae, tenuiter villosae 

 fibriUis obsitae. Gulmi erecti; steriles abbreviati, foliati; fertiles elongati, adjecta panicula bipe 

 dales et altiores, simplices, teretes, striati, binodes, ad et infra nodos piloso-hirsuti. Folia an 



guste linearia, superne angustato-subulata , rigida, utrin^e pilosa, externe striata, mterne 

 sulcata, plana, sicca saepe convoluta, 6-io-polHcana; sesquilineam lata. Vaginae teretes, striatae, 

 usque ad basim fissae^ moUiter pilosae, 4-6-pollicares, internodiis panmi breviores. Ligula : 

 margo angustus, piloso-ciliatus. Panicula simplex, 8-9-pollicaris, secundaj ramis solitariis, 

 erectis,filiformibus, angulatis, fulvescenti-pilosis, versus medium ramulo auctis, summisindi- 



imis remotis et patentibus^ rhachi cummuni flexuosa, inferne teretiuscula , glabra, su- 

 perne angulata, angulis fulvescenti-pilosis. Spiculae in apice ramorum et ramulorum per ternas 

 congestae, cernuae, singulae breviter pedicellatae, biflorae, absque arista 7-8 lincas longae, adjecta 

 arista bipoUicares; duae (laterales) completae , terlia ( anterior) magis minusve elTeta \ glumis supc- 

 rioribus intus spectantibus ; pedicellis fulvescenti-hirsutis, condnuis. Fios iuferior cujuslibet 

 spiculae masculus, sessilis; superior hermaphroditus, stipitatus, basi barbatus; stipite brevi, ad 

 utrumque latus barbato. Glamae duae, inae^ales, patentes; inferior lanceolata , acata , canali- 

 culata trinervia, membranaceo-rigida, nervis prominentibus , externe ad ulrunK^ue latus ner- 

 vorum tubercuhs creberrimis, ssepe confluentibus, ad nervum mediam minoribus, fuscis dense 

 obsita, tuberculis pihferis; pilis fulvis vel aureo-luleis, rigidis, patentissimis ; gluma superiori 

 longior 6-7 lineas longa, lanceolata, superne angustata, apice subtruncata, integra, subconvo- 

 luto-canaliculata , trinervia, nervis viridibus, apice evanescentibus, externe ad utrumcjue latus 

 pilis rigidulis fulvescentibus obsita. Flos masculus : Paleae duae; inferior glumae superiori similis 

 ipsaque \ brevior, oblongo-lanceolata, apice rotundato-obtusa, integra, convoluta, superne 



carinata, trinervia^ chartaceo-memb 



dibus, lateralibus apicem versus eva 



bus superiorem amplectens j palea superior dimidio brevior, oblongo-lanceolata , apice 

 emarginato-bidentata , dentibus acutis, hyalino-membranacea, binervia, nervis remotis, dorso 

 plana, marginibus inflexis bicarinata, carinis ciliatis. Squamulae duae, collaterales, carnosa^, sub- 

 dolabriformes , glabrse. Stamina duo, lateraha. Filamenta linearia, glabra. Antherae lineares, 

 utrinque bifidae, biloculares, pallide croceae, glabrae. PistiUi rudimentum Hneari-fiHforme. Flos 

 hermaphroditus : Paleae duae, longitudine suba^^uales; inferior oblonga, apice bifida, inter lobos 

 lanceolatos acutatos aristata, obsolete septemnervia , subcoriacca, externe molUter pubescens, 

 cvlindraceo-convoluta superioremque arctc involvens. Arista bipoUicaris, subulata, pilis minutis 

 oubescens supra medium geniculata, infra genu nigra et spirahter torta, basi subarticulata, 

 Lnra aenu fuscescens, rectiuscula. Palea superior oblongo-lanceolata, membranacea, apice 

 nbtnsiuscula obsolete bidentata et ciHolata, navicularis , dorso binervia, nervis crassis approxi- 

 Itis dabrl Squamul^ du^, coUaterales, triangulan-dolabriformes , acutae integrae vel ex- 

 rne^dente acuto auct^, carnos^, glabr^, ovarium superantes. Stamina duo, hypogyna. 



