THE GENERA AND THEIR SPECIES. 



67 



palea longer than glumes, smooth, rough at apex, ribs five, a 

 long, rough, slender awn projecting from apex ; inner palea 

 fringed, and having two green marginal ribs. 



As the term M node " has not been defined so far as we have 

 gone, it should be said that by it the joint itself is meant. In 

 some books the interval between joint and joint is also called a 

 joint. To avoid this the joints are herein called nodes — the 

 correct term — and the intervals internodes. There are really 

 two kinds of nodes, those of the stem itself and those of the sheath, 

 but in these descriptions the distinction is immaterial. 



Agrostis. Plate ix. AGROSTIDEM. 

 Awnless. 



26. alba 



Awned 



27. canina 



24 in. Fiorin. Leaves rolled or flat. 



12 in. Bent. Radical leaves setiform; panicle 

 branches long ; awn from below middle of 

 keel. 



28. setacea 24 in. Bristle Bent. Radical leaves setiform ; 



panicle branches short ; awn from base 

 of keel. 



29. spica-venti 36 in. Silky Bent. Leaves all flat ; panicle 



branches long ; awn from above middle 

 of keel. 



26. A. alba. Pastures and fields ; ranging almost everywhere 

 north and south of the Tropics, even 

 within the Arctic circle. July and 

 August. Root perennial, creeping, reach- 

 ing a foot in depth. Stem frequently 

 procumbent at first rooting from lower 

 nodes, then erect, smooth, striated ; 

 nodes smooth. Leaves flat or rolled, 

 short, rather broad, thin, ribbed, ridges 

 prominent, rough. Sheaths rough, A . t 



° ° Agrostis alba. 



striated, colourless; ligule longer than spikeiet. For Floret see p. 46. 



