50 M>'. Woods on the Genera of European Grasses. 



That the calyx is wanting in Leersut, Lygeum, Coleanthus, and Nardus. 

 That it is setigerous in Scs/eria, Phleiim, Pohjpogon, Lappago, Lagiirus, Hor- 



deu/n, u^gilops, and sonietinics in Triiicum and Elipnus. 

 That Psilnrus, and soniotiines Eriunthus, and according to some authors, 



Fesfuca nn/urus, F. hromoides, and F. uniglumis are monandrous. 

 That Lnperata, Erianthus sometimes, Antlioxanthum, Cri/psis uculeafu, Bro- 



mus diandrus, Coleanthus, and the perfect flower of Hierochloe, are dian- 



drous. 

 That Nardus, Lygeum, and Ech'inaria have only one stigma. 

 That the styles are nnited in Seslcria, Spartina, and some species of Alope- 



curus. 

 That Ori/zu has 6 stamens. 

 That Andropogon, Sorghum, Lappago, and Hordeum have some of their spi- 



culœ barren, and therefore belong to the Linnean class Monœcia, or 



rather, perhaps, to Polygamia. 

 Tiiat Zea alone of all Grasses found or commonly cultivated in Europe has 



fertile flowers without anthers, and tliat these and the barren flowers are 



in difterent parts of the plant. 



A. Barren and fertile inflorescence separate ! 



1". Zea. Barren spiculœ 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. 



18. Lygeum. Glume 0. Spiculœ enveloped in silky hairs. Outer palea thick 

 and firm ; inner scariose. 



C. Spiculse in opposite rows on an alternately channelled rachis. 

 1. Spiculie 2 or more flowered, all perfect. 



(58. Braehypodlum. Glumes unequal, ribbed, much smaller than the outer 



palea. Spiculse on short stalks. 

 6/. Lo/lum. Spiculte placed edgewise on the racliis ! Lower glume very 



obscure, or wanting. 

 69. Triticum. Glumes nearly equal, opposite, broad, embracing the solitary 



