Vl] INFLORESCENCES 91 



Inflorescence, a compact more or less tufted panicle. 



Molin la . A ira prcecox'. 



Kceleria. A. canescens. 



Triodia. Sesleria. 

 Dactylis. 



And rare grasses like Polypogon, Gastridmm, &c. 



Inflorescence, a loose plume-like or branched panicle. 



Avena. Milium. 



Bromus. Agrostis. 



Arrhenatheru'in. Melica. 



Catahrosa. Holcus. 



Aira (except A. pru'cox and Poa (most of the species). 



A. canescens). Glyceria. 



Arundo. Briza. 



Digraphis. Festuca (except F. Myurus). 



And the rare HierocMoe. 



The Glumes are always present in our grasses, and 

 rudimentary only in the rare grass Leeisia; but Lolium 

 and Nardus have only one glume to the spikelet, and 

 Hierochloe, DigrapMs and Anthoxanthum (Fig. S2) have 

 four or six. Our other grasses have tivo, but often unequal 

 in size. 



In shape they are usually boat-like, j^ointed or obtuse 

 {Briza) and frequently with a distinct keel {Anthoxanthum, 

 Digraphis, Phleum, &c.) or with ridges, green lines (veins) 

 and other characteristic markings (e.g. BigrapJtis). The 

 tip may be extended into a stiff long point or awn {Ag- 

 ropy7nim, Phleum, Nardus) and the keel, ribs, and awn 

 may have hairs or serrulse on them. The rule is, how- 

 ever, that the glumes are not awned. In texture the 

 glumes may be herbaceous and green-brown or purple 



