Mr. Woops on the Genera of European Grasses. 13 
some species of Andropogon itself,) where in some genera the sessile spiculæ 
are perfect, and the stalked ones barren. Pairs or groups of spiculæ occur. 
also in Digitaria, but on a one-sided rachis, and in Elymus and Hordeum, 
where they are on a rachis with opposite channels. 
3. Spiculz solitary, in a panicle, with a rudiment or imperfect floret within 
the outer glume of the calyx, or even with a rudiment or imperfect floret on 
each side, but below the perfect floret. This description applies to all the 
PHALARIDEE except Lygeum and Zea, which have only a doubtful claim to a 
place in that tribe, and to Ærrhenatherum. Among the Oryze# 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. Ctenium among the CuronipE e, and some of the Rorr- 
BOELLIACEÆ, are said to have external imperfect florets or rudiments, which, 
however, occur in no European genus of these tribes. Panicum also would be 
included under this head. 
4. Spiculæ in two rows on one side of a flattened rachis. "This is the in- 
florescence of the remaining European PanicezÆ and of the Curompgs. It. 
occurs, as already stated, in most species of Andropogon, in Nardus, and in Cy- 
nosurus cristatus. In Knappia the rachis is not flattened or triangular. Triticum, 
Nardus, and T. unilaterale belong to this division, and perhaps Oreochloa. 
5. Spiculæ with more than one perfect floret disposed in a panicle equal all 
round. This contains the remaining ARUNDINACEZÆ, the AVENACEZ, except 
Arrhenatherum ; and among the Fesrucacem, Poa, Glyceria aquatica, Cuta- 
brosa, Melica, Molinia, Keleria, Schismus, and Bromus. 
6. Spiculæ in a one-sided panicle. In other respects like the last. This 
" contains the remainder of the Festucacew, except Sesleria, which belongs to 
the following. 
7. Spicule in a spike or head, tiled all round. Here we place Echinaria and 
Sesleria. 
8. Spiculæ in opposite rows, on an alternately channeled rachis. This divi- 
sion includes the Hordeacec and Rottboelliaceæ, with some exceptions, which 
have been already noticed. "The description would also apply to Festuca mari- 
tima (Triticum maritimum, Auct.), and F. divaricata, and to Gaudinia ( Avena) 
fragilis. 
