Mr. Woods on the Genera of European Grasses. 13 



some species of Andropognn itself,) where in some genera the sessile spicula? 

 lire perfect, and the stalked ones barren. Pairs or groups of spiculœ occur 

 also in Dlgifar'ni, but on a one-sided rachis, and in Elymns ami Ilunlcion, 

 where they are on a rachis with opposite channels. 



3. Spiculœ solitary, in a panicle, with a rudiment or imperfect floret within 

 the onter glume of the calyx, or even witli a rudiment or imperfect floret on 

 each side, but below the perfect floret. Tliis description applies to all the 

 Phalaride^ except Lt/geum and Zea, which have only a doubtful claim to a 

 place in that tribe, and to ArrJienatlierurn. Among the Orvze.e also several 

 of the foreign genera are described as having indications, more or less com- 

 plete, of an imperfect inferior floret, though the two European genera exhibit 

 nothing of the sort. Ctenluin among the Chloride.^;, and some of the Rott- 

 BOELLiACE.E, are said to have external imperfect florets or rudiments, which, 

 however, occur in no European genus of these tribes. Pan'nmn also would be 

 included under this head. 



4. Spiculœ in two rows on one side of a flattened rachis. This is tiie in- 

 florescence of the remaining European Panice/E and of the Chloriue.e. It 

 occurs, as already stated, in most species of .Indropogon, in A^ardus, and in Ci/- 

 twsui-us crisfafus. In Knapp'iu the I'achis is not flattened or triangular. Trifivnni, 

 Nardus, and 3'. unilatérale belong to this division, and perhaps Oreochloa. 



5. Spiculœ with more than one perfect floret disposed in a panicle equal all 

 round. This contains the remaining Arundinace.e, the Avenace.e, except 

 Arrhenatlierum ; and among the Festucace^, Poa, Gli/ceria aquutica, Cuta- 

 hrosa, Melica, Molinia, Kœlerla, Schismus, and Bromus. 



6. Spiculœ in a one-sided panicle. In other respects like the last. This 

 contains the remainder of the Festucaceœ, except Sesleria, which belongs to 

 the following. 



7. Spiculœ in a spike or head, tiled all round. Here we place Echuiaria and 

 Sesleria. 



8. Spiculœ in opposite rows, on an alternately channeled rachis. This divi- 

 sion includes the Hordeaceœ and Rottboelliaceœ, with some exceptions, which 

 have been already noticed. The descrij)tion would also apply to Festuca inari- 

 tima (Triticum maritimuni, Auct.), and F. dicaricafa, and to Gaudinia {Annui) 



fragilis. 



