XXVI 



Spikelets imbricated round the rachis. 

 1. Anthoxanthum. — Flowers diandrous ; with two awned outer palesB, 

 one on each side of the flower. 



4. Alopecurus. — Flower with a single palea, awned from the base. 



5. Phalaris. — Flower with a palea-like scale on each side 



below, the presumed representatives of two 

 others, as in Anthoxanthum ; but distinguished 

 from that genus by being triandrous. 

 P. arundinacea has a loosely panicled inflo- 

 rescence. 



6. Ammophila. — Flower with sUky hairs at the base. 



7. Phleum. — The inflorescence resembles that of Alopecurus; 



but the glumes are bristle-pointed, and the 

 paleae two and awnless. 



8. Lagurus. — Glumes fringed and hair-pointed. Outer palea 



with two terminal hairs, and a long dorsal awn. 

 11. Stipa. — Spikelets few, distant. Outer palea investing 



the ripe fruit, and terminating in a long, 

 twisted, and knee-bent feathered awn. 



Spikelets alternate on opposite sides of the rachis. 



40. Hordeum. 



45. Lepturus. 



-Spikelets three together on alternate sides of the 

 notched and jointed rachis. Outer palea 

 awned, investing the ripe fruit. 



-Spikelets solitary, imbedded in the rachis, which 

 separates at the joints. Glumes two, collateral. 



** Inflorescence spicate. Spikelets two- to many-flowered. 



24. Koeleria. 



25. Sesleria. 



27. Setaria. 



-Spike rounded, interrupted below. Glumes 



shorter than the flowers. 

 -Spike rounded, compact. Glumes as long as 



the flowers. 

 -Spike cylindrical. Spikelets surrounded by 



rough bristles. 



