198 



loiig!. MagnitiiJo spicularum conspicue varialnlis, Bractea exterior 

 pcrbrevis, oMu&issima. P. ubortivum (R. Br. Pr. 193) secuudum 

 diagnosim quidem perbrevem ad P. spinescens pertinet. Setariae 



ppecies mediaTite Cbamaeraphis sectione ad Panicum facillime 

 reduces. Gramen P. splnescenti haud dissimilc, sed potius iu 

 Guruotia3 genus prope G- strictam Inserendum misit cL Thozet a 

 Eockhampton. 



Panicum pubigerum (Roem. et Schult, Sjst. Veg. ii. 460 ; P. 

 pubescens, R. Br. Pr. 190) plantam fortasse includit me prope 

 Providence-Hill alibique in Arnhemia repertam^ sed dum exem- 

 plaria Brunonis authentica nobis hine desunt e brevisslma de- 

 finitlone prodromi nullibi aucta haud tuto recognoscendam. Mea 

 species ligulam brevissimam ciliarem, spiculas circiter 2"' lon^ 

 bracteam interiorem secus nervos tuberculato-hispidam bis terve 

 longiorem, florem sterilem fere glabrura et fructum acutum sub- 

 tilissime rugatum ostendit. Hsec stirps probabiliter perennat et 

 hirsutie spicularum P. Crus Galli approximat. 



Panicum Crus Galli (L. Sp. 83 ; P. Crus Corvi, L, Sp. 84 ; P. 



colonum, L. Sp. 84 ; P. tetrastachyum, Forsk. FI. iEg. Arab. 19 ; 

 P. pseudocolonum, Roth. Nov, Plant. Spec. Ind. Or. 47 ; P. his- 

 pidum, G. Forst, Florul. Ins. Austr. Prodr. 7 ; P- cuspidatum, 

 Roxb. Flor. Ind. 301 ; P. longisetum^ Torrey in Sillim. Journ. ii. 

 134 ; P. echinatum, Jacq. Eclog, ii. t. 20 ; P. Crus Pavonis^ Nees 

 Agrost. Brasil, 258 ; P. hispidulum, Retz, Obs. v. 13 ; P. zonale, 

 Guss. Flor. SicuL Prodr. i. 82 ; P. haenaatodes, Presl. Fl. Sicul. 

 p. 43 ; Ecbinochloa Crus Galli, Beauv. Agrost. 53 ; E. Crus Corvi, 

 Beauv. I. c. ; E. zonalis, Parl. Fh Panorm. i. 119 ; E. colona, Parl. 

 Pl- Nov, p. 40 ; Oplismenus Crus Galli, Kunth. Gram. i. 44 ; O. 

 eolonus, Humb. Bonpl. et Kunth. Nov. Gen. et Spec. -ffiquin. i. 

 109; 0. pseudo.-colonus, Kunth. Gram. i. 44 ; Orthopogon Crus 

 Galli, Sprcng, Syst. i. 307 ; O. Retzii, Spreng. 1. c. 307) in re- 

 gionibus calidioribus Australiae videtur indigenum usque ad flumcn 

 Mtirray, in Au.^tralia felice et orientali extratropica sicut occiden- 

 tali fortasse cultm-a dispersum, Prseter synonyma supra data 

 pluria alla absque dubiis huic gramini e variis operibus adscribenda. 

 Fere omnes hujus speciei varietates in Australia reperimus, Ita 

 illam aristis longissimis, eam aristis nullis, eam panicula setulis 

 copiosis interspersa eamque petiolis hispidissimis. Radix annua. 

 Caules paucipollicares usque octo-pcdalcs. Ligula nuUa. Spiculai 

 magis minusve hispidute. Caryopsis addito calyce rostrata, lcevis- 

 sima et nltidissima. P. stagninura (Rctz. Obs. v. 17 ; P. scabrum, 

 Lam. Encyel. Meth. iv. 744 ; P. pictum, Kocnig sec. Nees in Mart. 

 Bras. ii. 260) specifice haud distinguitur ligula e pilis confertis 

 formata. Varletatem quoque tantum sistere videtur P. lacunarium 

 (F. M. in Transact. Vict. List. 1855, p. 47) ; pallidius vlrcscit ; 



spicula) in paniculam perangustam minus regulariter dispositoc, 

 fere omuino ci^labra^. 



