GRASSES OF SCOTLAND. 



XIXETY-FOUR SPECIES. 



CLASS MOXOCOTYLEDOXES. 



Stem with no distinction of bark, wood, and pith ; increasing in 

 the centre, so that the oldest formation is external. Leaves with pa- 

 rallel veins. Cotj-ledon one ; radicle inclosed in a sheath. 



ORDER GRA:\nXE.E of Jussieu. 



Root fibrous, creeping, or bulbous. Stem cylindrical, hollow, clos- 

 ed at the joints, bearing leaves with a split sheath, through which the 

 stem passes. 



Inflorescence spiked, racemed, or panicled. Flowers or spikelets con- 

 sisting of a cah-x containing one, two, or many florets. 



Calyx situated the most external, composed of two glumes, rarely 

 of one only, or entirely wanting ; the upper glume generally the 

 largest. 



Florets of two paleae, seldom of only one, (corolla, Linn, perianth^ 

 Brown.) the outer the largest, generally keeled, having one, thi'ee, 

 five, or many longitudinal ribs ; often bearing from the summit, back, 

 or base, an awn of various lengths ; the inner palea with usually two 

 distant, fringed ribs, each at a lateral fold. 



