444 GBAMiNE^ Pennisetum. 



PENNISETUM (Pal. de B. Agrost. 59. — Gymnothrix P. de B. — 

 Penicillaria Willd.). 



Spiculse a dorso compressse supra pedicelii articulationem invo- 

 lucro completo multisetoso cum spiculis deciduo involucratse, setse 

 exteriores breviores scabrse, interiores parte inferiori (in nostris) 

 plumosae. FloscuU bini superior hermaphroditus inferior masculus 

 vel neuter et lunc adglumellam vel interdum ad aristulam reductus. 

 Glumse membranacese inferior minor. Glumella utriusqne flos- 

 culi acuta vel acuminata paleam subaequilongam sed angustiorem 

 amplectens. Squamulse binae minutae interdum nullse. Stamina tria. 

 Ovarium glabrum. Styli bini terminales longi ima basi vel longe in 

 unum connati stigmatibus plumosis ex apice floris emergentibus. 

 Caryopsis oblonga a dorso compressa ad basin ventris hilo puncti- 

 formi obsita glumellis inclusa sed libera. — Herbse spicuiis 1-3-nis 

 in spicas simplices dispositis. 



Sect. I. EUPENNISETUM. — Involucri setae teuues capillares 

 spiculam manifeste superantes. Styli liberi vel ima basi 

 connati. 



1. P. dichotomum (Forsk Descr. 20 sub Panico) perenne 

 dumosum glabrum, culmis duris junceis rigidis parte inferiori per- 

 sistentibus ad nodos prolifere et fasciculatlm ramosis, culmorum 

 vaginis aphyllis apertis scariosis lanceolatis persistentibus, foliis 

 rameis e vagina subdilatata brevibus rigidis convolutis supremo 

 saepe spicam involucrante, spicis cylindraceis, rachide aspera glabrS, 

 involucri sessilis setis numerosis insequalibus albidis interioribus 

 validioribus inferne plumosis spicula sesquilongioribus, spiculissoli- 

 tariis rarius binis lanceolatis, glurna exteriore oblongo-lanceolata 

 acuta trinervi lerlia parte breviore. superiore glumellaque floris 

 masculi aequilongis florem hermaphoditum eequantibus concavis 

 5-7-nerviis oblongo-lanceolatis acuminatis, palea floris masculi 

 angustiore et subbreviore, floris hermaphroditi glumella oblongo- 

 ianceolata acuminato-subaristata %. P. dichotomum Del. Eg. 144, 

 tab. 8, fig. — Pennisetum phalaroideum Sch. — Phalaris setacea 

 Forsl^ Descr. 17. — Cenchrus ramosissimus Poir. Enc. VI, 51. 



Hab. in arenosis vallium deserti Arabici Egypti ad Kahiram, Suez, Egyp- 

 tum mediam (Forsli, Del.. Sieb I Kral ! etc). Arabi^ Petrea (Bove ! Auch! 

 Schimp. 151!), Arabioe regno Mascate et Persiil australi (Auch. 5432!), Affgha- 

 iiia ad Otipore Griflf. 321 !). 



Facies et ramificatio Panici turgidi. 



Ar. Geogr. Algeria interior, India boreali-occidentalis. 



