Neue Gräser aus Brasilien. 



75 



6. Stipa tenuiculmis Hack. n. sp. 



Perennis. Bhizoma hreviter repens, non stolonifemm, innova- 

 tiones omnes extravag inaJes hasi incrassatae. Culmi erecti circa 70 cm 

 altipro altitudine gracillimi (diam. in parte inf. circa 0'8 mm), teretes 

 glaberrimi 2 — 3-nodes nodo superiore circa in ciilmo medio sito, sim- 

 plices. Vaginae teretiuscidae arctae, apice altero margine ciliolatae 

 ceterum glaherrimae. Ligida margo memhranaceiis angiistus. Laminae 

 anguste lineares temti - acuminatae saephis convolutae stihjunceae 

 (diam. 0' 8 mm), r ar im inferiores planiusctdae, l'5mm latae, suhtus 

 scahrae supra laeves ihique nervis crassis stihcontiguis percursae, 

 erectae virides 10 — 20 cm longae. Panicula lanceolata paupera stih- 

 contracta laxa circa 10 cm longa, ramis solitariis v. hinis cum rJiachi 

 scahertäis teniii-filiformihus, primario infimo dimidiam panicidam suh- 

 aeqiiante secundaritim hasilarem v. superius enatum edente, 1 — 2-spi- 

 culatis, spiculis longitisctde pedicellutis. Spiculae Uneari-lanceolatae, 

 18 — 20 mm longae, dilute violascentes. Glnmae steriles inaeqnales, 

 1. major, circa 19 mm, IL 15 mm longa, iitraque linear i-lanceolata 

 aciitissima, 3-nervis, laevis. Gluma fertilis 9 — 10 mm longa, lan- 

 ceolata, hasi in callum pungentem curvtdtm 2'o mm longum, hreviter 

 harhatum constricta apice partim attenuata Jiaud corontdata nec 

 ciliolata, cum arista iarde articulata hasi et secus nervös (5) ad 

 medium vel ad ^js usque appresse puhescens (pilis ut Uli calli gil- 

 vescentihus), ceterum scahriuscida, demum alho-viridtda; aristae ad 

 6 cm longae, suhrohustae columna circa 35 cm longa, glahra sca- 

 henda, sid)ida in ^/^ inferiore suljgeniculata scahra. Palea circa 

 1 mm longa, ovata. 



Rio Grande do Sid: in campis propre Lagäo, Municipio Sole- 

 dade^ Dec. 1910, leg. G. Jürgens. 



Verwandt mit St. ßiculmis Del, deren Deckspelze aber nur 

 am Gallus behaart, sonst kahl ist, während bei unserer Art 5 un- 

 gleich lange Haarleisten längs der Nerven verlaufen. 



7. Trisetum (?) Jürgensii Hack. n. sp. 



Perenne. Cidmi erecti ad 70 cm alti, suhrohusti teretes superne 

 scahri circ. 6-nodes simplices vel ramido hrevi foliifero aucti. Vaginae 

 internodiis hreviores teretes laxiusculae scaherulae. Ligula ovata 

 ohtusa, 2 — 3 mm longa, dorso ininute hirtida. Laminae pro altitudine 

 playitae hreves (4— 5 cm longae), circa 1'5 mm latae, siccando laxe in- 



