CJRASSES OF SCOTLAND. 



GENERA. 

 * Calyx icanting. 



1. NARDUS. — Spikelets sessile, of one floret, ai-ranged on one 

 side of the rachis. Of this genus we have but one species. (Plate II.) 



* * Calyx containing but one Floret. * 



2. ROTTBOLLIA. — Spikelets sessile, arranged on each side of the 

 rachis. Calyx of two, lanceolate, parallel valves, spreading only whilst 

 in flower. One species. (Plate II.) On some occasions the calyx 

 contains two florets. 



3. ALOPECURUS. — Inflorescence a dense panicle. Floret of 

 only one palea, very little shorter than the calyx, with a long dorsal awn 

 arising from below the centre, which in A. alpinus is sometimes want- 

 ing. Five species. (Plates HI. IV. V.) 



8. PHLEUM.T — Inflorescence a dense panicle. Floret of two paleae, 

 much shorter than the calyx ; outer palea occasionally with a minute 

 awn arising from the summit. Base of floret without hairs or appen- 

 dages. Four species. (Plates VI. VII.) 



12. ANTHOXANTHUM.— Inflorescence a close panicle of an 

 ovate-oblong form. Glumes of the calyx very unequal. Floret of 

 two hairy paleae of equal length, both awned, much shorter than the 

 calyx. One species. (Plate VIII.) 



13. AMMOPHILA. — Inflorescence a close panicle of an oblong 

 form. Glumes of the calyx narrow, acute, not awned. Floret very 

 little shorter than the calyx, tipped with a short awn, hairy at the 

 base. One species. (Plate VUI.) 



14. PHALARIS. — Inflorescence compact or branched. Floret 

 hairy, not awned, with two hairy or membranous valves at the base, 



* A rudiment of a second floret is equivalent to a perfect floret, and therefore belongs 

 to the next division. Melica unifiora and MoUnea depauperata are the only examples' 

 (Plates XVIII. XIX.) 



