22 



14. Racemes 2-9 inches long, on the main culms 15 



Racemes ^-H inches long, on branches of a panicle 19 



15. Lower glumes dorsally flattened. Keels broadly winged 



above A. distachyus. 



Lower glume with a narrow groove. Keels not winged l<5 



10. Blades very narrow, filiform A. liliiolius. 



Blades linear 1-5 lin. broad 17 



17. Blades rounded or sub-cordate, and sub-amplexicaul at 



the base A. ampleetens. 



Blades narrow at the base 18 



IN. Culms simple. Blades 1-2 lin. broad 



A. schirensis var. angustifolia. 

 Culms branched. Blades 2-3^ lin. broad ... A. schinzii. 



19. Column of the awn glabrous 20 



Column of the awn pubescent or hirsute 22 



.20. Leaf sheaths quite glabrous. Lower glume of sessile 

 spikelets with a narrow groove from the middle down- 

 wards A. schoeiianlhiis. 



Lower sheaths firm, fugaciously hairy to tomentose at 



the base. 

 Lower glume of the sessile spikelets flattened or con- 

 cave... 21 



■21. Keels of lower glume winged above 



A. nardus var. marginatus. 

 Keels of lower glume rounded. Scarcely winged ... 



A. plurinodis. 

 '22. Callus of I lie sessile spikelets very short or obscure, 



obtuse 23 



Callus of the sessile spikelets acute, up to 1 lin. long, 



densely bearded 30 



"23. Spathes broadly laneeolate to ovate. l-\ inch long ... 



A. cvmbarms. 



Spathes narrow linear to lanceolate, 1-3 inches long... 24 



24. Spikelets of the lowest 2 pairs of peduncled racemes alike 



in form and sex A. buolianani. 



Spikelets of the lowest pair of the peduncled raeeme of 



different sex 25 



'25. Racemes short, 2-5 jointed A. dicbroos. 



Raeemes long, 5- many jointed 20 



20. Spikelets silvery villous 27 



Spikelets not silvery villous 28 



"27. Tall stout culms. Common peduncles laterally exserted. 



A. auctus. 

 Slender eulms. Common peduncles equalling or exceed- 

 ing the spathes \. hirtns. 



