70 E. Hackel. 



Neue Gräser aus Brasilien. 



Von 



E. Hackel. 



(Eingelaufen am 24. Mai 1914.) 



1. Panicum (Sect. Harpostacliys) Jürgensii Hack. n. sp. 



Culmi 80 — 140 cm alti subcompressi, apice pubescentes ceterum 

 glaherrimi, plurinodes, simpUces. Vaginae teretiusculae internodia 

 siibsuperantes glaherrimae nisi fancihus ciliatae. Ligula hrevissima 

 menibranacea truncata. Laminae e hasi angustata lanceolato-lineares 

 actitiuscidae, inferiores ad 50 cm longae superne ad 10 mm latae, 

 superiores cidmi mox decrescentes, summa ad mucronem 2 — 4 mm 

 longum redacta, omnes rigidae, erectae, parte infima subconvolutae 

 superne planae (in ■'/s superiore laüores), in ligulae dorso pilis 

 stipatae, supra glahrae nervis crehris prominentibus suhconügnis 

 percursae, subtus pilis adpressis plus minus dense obsitae vel glabre- 

 scentes, marginibus laeves. Racemus ierminalis solitarius rohistus 

 subfalcatus ad 15 cm longus rhachi lata (spiculis plus triplo latiore) 

 concava^ spicidas omnino vel ad ^js usque occultans, explicata 6 mm 

 lata chartacea (etiam marginibus), glaberrima; spicularum pedicelli 

 solitarii v. bini brevissimi glaberrimi. Spicidae imbricatae, inordinate 

 3 — 4-seriatae patulae flavo-virididae glabrae obovato-vel clavato-ob- 

 longae, 5 mm longae infra apicem 2 mm latae, valde convexae. Gluma 1. 

 parvida (0'8 mm lg.) hyalina, truncata emarginata enervis; IP'* spi- 

 culam subaecpians obovata chartacea valde convexa, apice rotiindato 

 cucullata, margine incurvo erosula, nervis 9 extus prominentibus per- 

 currentibus adjectis aliquot intermediis tenuibus breviorihus percursa; 

 HI. spiculam aequans, chartacea, ovali-oblonga apice obtusissimo 

 cucullata, margine apicali hyalina incurvo, in ipso apice chartaceo 

 denticulis 3 minutis triangularibus acutis quasi minute tricornis, 

 dorso depressa., 7-nervis, pialeam fovens aequilongam oblongam acutius- 

 ctdam bicarinatam membranaceam floremque mascidum triandrum 

 antheris 2 mm longis; gluma IV. spicidam aequans elliptico-lanceolata 

 acutiuscida cartilagineo-chartacea obsolete 3-nervis, laevis sed non 



