50 Mr. Woops on the Genera of European Grasses. 
That the calyx is wanting in Leersia, Lygeum, Coleanthus, and Nardus. 
That it is setigerous in Sesleria, Phleum, Polypogon, Lappago, Lagurus, Hor- 
deum, Ægilops, and sometimes in Triticum and Elymus. 
That Psilurus, and sometimes Erianthus, and according to some authors, 
Festuca myurus, F. bromoides, and F. uniglumis are monandrous. 
That Imperata, Erianthus sometimes, Anthoxanthum, Crypsis aculeata, Bro- 
mus diandrus, Coleanthus, and the perfect flower of Hierochloe, are dian- 
drous. 
That Nardus, Lygeum, and Echinaria have only one stigma. 
That the styles are united in Sesleria, Spartina, and some species of Alope- 
curus. 
That Oryza has 6 stamens. 
That Andropogon, Sorghum, Lappago, and Hordeum have some of their spi- 
cule barren, and therefore belong to the Linnean class Monæcia, or 
rather, perhaps, to Polygamia. 
That Zea alone of all Grasses found or commonly cultivated in Europe has 
fertile flowers without anthers, and that these and the barren flowers are 
in different parts of the plant. 
A. Barren and fertile inflorescence separate ! 
17. Zea. Barren spiculæ 2-flowered, in a terminal panicle. Fertile, in a 
dense spike, 1-flowered, with an exterior rudiment. 
B. Perianthium hardening into a 2- or 3-seeded nut. 
- Lygeum. Glume 0. Spiculæ enveloped in silky hairs. Outer palea thick 
and firm; inner Scariose. 
a 
C. Spiculæ in Opposite rows on an alternately channelled rachis. 
1. Spiculæ 2 or more flowered, all perfect. 
68. Brachypodiu + Glumes unequal, ribbed, much smaller than the outer 
palea. Spiculæ on short stalks. . 
67. Lolium. Spicula placed ed 
obscure, or wanting. 
69. Triti 
cum. Glumes nearly equal, opposite, broad, embracing the solitary 
sewise on the rachis! Lower glume very 
