16 { 



572 THE GEASS FAMILY. 



■],(■ Flowering glumes without awns 8. Phleitm- 



t Flowering glumes awned as well as the outer ones 15 



, f. (■ Spike ovate, with softly silky hairs 11. Habe's-taii.. 



1 Spike cylindrical or branched, not hairy 12. Beabdgeass. 



Spikelets l^owered, in a loose panicle. 



Spikelets ovate, obtuse or scarcely acute 17 



Spikelets lanceolate, very pointed 19 



f Spikelets very flat, consisting of only 2 glumes, both keeled ... .1. Lekksta. 

 17^ Spikelets scarcely flattened. Two outer empty glumes about the size of the flowering 



L one 1*^ 



( Spikelets rather large, containing within the outer glumes, besides the flower, a small, 

 tqJ wedge-shaped, terminal, glume or rudimentary flower 38. Melick. 



I Spikelets smaU, containing nothing besides the flower within the outer glumes. 



L 3. Milium. 



r SmaU tufts of hairs or hairy appendages at the base of the flower within the outer 

 19.3 glumes 20 



(.No hairs or hairy appendage at the base of the flower vrithin the outer glumes . 21 



i' No awns. A small hairy appendage at the base of the flower on each side. 



[,„) 7. DiGRAPHIS. 



" j Flowering glume with a short fine awn. A taft of hairs at the base of the flower. 



C 16. Smallkeed. 



rAwns to all the glumes 12. Beaedgbass. 



21 J, Awns (often very small) to the flowering glume only. Outer glumes pointed, but not 



l^ awned 22. 



nt, (■ Outer glumes swollen and very shining at the base 14. Nitgrass. 



"" (^ Outer glumes not enlarged at the base 13. Ageostis. 



(■ Spikelets all sessile in a simple spike (branched only in accidental luxuriant spe- 

 23 < cimens) 25 



(. Spikelets single or clustered, in a loose and spreading or close and spike-like panicle 24 

 n , f Awns to some or all the glumes SO 



(. SpUtelets entirely without awns 39 



Spikelets 2- or more flowered, sessile in a simple spike. 



("Two spikelets to each tooth of the spike 25. Ltmegeass. 



25 i Spikelets all soUtary 26 



(.Spikelets clustered along the axis of the spike 40 



„„ C Spikelets with their sides to the main axis of the spike 27 



i Spikelets with one edge (the backs of the glumes) to the main axis 28 



I Outer glumes nearly equal. Spikelets very closely sessile or indented . 27. Teiticum. 



[. Outer glumes unequal. Spikelets almost "sessile 29. False-Brome. 



f One empty glume at the base of each spikelet (except the terminal one). Spikelets 

 28^ indented in the axis 28. Lolium. 



I Two empty glumes at the base of each spiielet. Spikelets almost sessile . . . 29 



• Perennial. Spikelets 6 hues long or more Meadow Fescue. 



. Annual. Spikelets not above 3 fines long Darnel Poa. 



Spikelets 2- or moreflowered, panicled, awned. 



r Flowering glumes all awned 31 



. Spikelets with 1 awnless perfect flower, and 1 awned male flower 37 



(Awns inserted on the back of the flowering glumes below the centre. Hairs on the 

 axis between the flowers short 32 

 Awns terminal. Flowering glumes surrounded by hairs longer than themselves. 

 42. Eeed. 

 Awns terminal or from above the centre. Axis of the spikelet without hairs . . 34 



oQ f Spikelets 2-flowered 33 



" \ Spikelets 3- or more flowered 18. Oat. 



(^Spikelets 2 lines or less. Awn fine, scarcely protruding beyond the glumes. 



qoj 17. AlBA. 



I Spikelets 3 or 4 lines long. Awn exserted. One of the flowers male only. 



I . 19. False-Oat. 



f Awns quite or very nearly terminal, sometimes reduced to a very short point . . 35 

 34 < Membranous edges of the glumes projecting in 2 points beyond the base of the awns. 



L 30. Beome. 

 gc (■ Spikelets crowded in a close spike or dense clusters 36 



t Panicle loose or contracted into a long one-sided spike 31. Fescuk. 



ggf Outer spikelet of each cluster consisting of empty glumes only . . 33. Dog's-tail. 



(.All the spikelets containing flowers 32. Cock's- foot. 



27 [J 



29{1 



