CHAPTER VII. 



THE GENERA AND THEIR SPECIES. 



~H=H 



'^PHESE arc arranged alphabetically for case in reference ; 

 -* the systematic order has been given in the preceding 

 chapter. The numbers arc those previously adopted 



Agkopyrum. 

 56. re pens 



Plate xviii. HORDE/E. 



36 in. Couch Grass, Root creeping ; awn of 

 outer palea short or absent ; leaves 

 generally smooth below. 



57. caul] iiini 24 in. Bearded Wheat Grass. Root not 

 creeping ; awn of outer palea long ; leaves 

 generally rough below. 



56 A. re pens. Eiclds in the Northern Hemisphere. Flowers in 

 June and July. Root perennial ; rootstock long, yellow, smooth, 

 extensively creeping and branching, 

 with sheathing rudimentary leaves at 

 the joints. Stems numerous, erect or 

 ascending, stiff, leafy below, round 

 and striated above. Leaves rolled in 

 bud, narrow, tapering, thin, rougn 

 above and on edges, occasionally 

 glabrous, auricled, spreading horizon- 

 tally generally in one direction, ribs 

 low and hairy. Sheath close ribbed, 

 shorter than leaves ; ligulc short, apex 

 finely toothed. Spike erect, flat, 

 rather close ; rachis angular and 



bristly on the angles. 



Spikelets 

 65 



Agropyrum re pens. 

 Spikelet. For Floret see p. 60. 



