14 



Tribe XII. — Hordew.. 



Spikelets one- to many-flowered, usually hermaphrodite, sessile 

 along the common rachis, forming a simple or compound spike;' 

 glumes awned or awnless. 



A small tribe of twenty genera and about one hun- 

 dred and thirty species. It is an imi)ortant division, 

 however, for it includes rye, barley, and the many vari- 

 etiesof wheat. English and Italian Eye- grasses (io/titw 

 species) are the chief meadow grasses of the tribe. 



Nardus Linn.* Secale Linn. 



Lolium Linn.* Triticum Linn. . 



Lepturns R. Br. Hordeum Linn.* 



Scribneria Hack.* Elymus Linn.* 



Agropyrou Gaertn.' Asperella Humb.* 



Tribe XIII. — Bamhuneai. 



Spikelets two- to many-flowered (rarely only one-flowered) in 

 racemes or panicles; empty glumes at the base of the spikelet 

 two to several; flowering glumes many-nerved, awnless, or very 

 rarely short-awned ; culms woody, at least near the base, and 

 perennial ; leaf blade usually with a short petiole articulated 

 with the sheath from which it Anally separates. 



A comparatively small tribe of twenty-three genera 

 and about one hundred and eighty-five species. The 

 s})ecies are confined chiefly to the region within the 

 Tropics. Many of them are of very great importance to 

 the natives of the countries where they grow. Manu- 

 factured articles of bamboo, either of use or for orna- 

 ment, are now a part of the commerce of the world. The 

 bamboos are remarkable for their woody stems and often 

 arborescent or tree-like habit of growth, some of the 



' Strictly the spike is simple when the sessile spikelets are one- 

 flowered, and compound when they are more than one-flowered. 



