Third class. 
5 
43. Glumes 0 ...... Oryza. 619. 
— Glumes 2 ........ 44 
44. Branches of the panicle simple, terminated by 3 spikelets 
Pollinia. 611. 
— Branches of the panicle (or secondary branches) bearing 
several spikelets . . . . . . 45 
45. Panicle composed of spikes . . Echinochloa. 616. 
— Panicle not composed of spikes .... 45 
46. Leaf-sheaths with numerous long spreading hairs 
Panicum. 617. 
— Leaf-sheaths without long spreading hairs. . . 47 
47. Stigs springing from the top of the spikelet. Glumellas 
awnless . ; Phalaris. 620. 
— Stigs springing from the base or side of the spikelet 48 
48. FIs surrounded by long hairs at the base . . 40 
— FIs without, or with very short, hairs . . . 50 
49. Awn almost 3 times as long as the glumella 
Lasiagrostis. 628. 
— Awn 0 or scarcely longer than the glumella 
Calamagrostis. 631. 
50. Hairs at the base of the fls about Vs as long as the glu¬ 
mellas .Calamagrostis. 631. 
— Hairs 0 or extremely short . . . . . > 51 
51. Glumellas hardened at maturity, cartilaginous Milium. 626. 
— Glumellas membranous, not hardened Agrostis. 630. 
52 (42). Stigs springing like a brush from below the summit 
of the fl.. 53 
— Stigs springing from the base, plumose . . . 54 
53. Spikelets with long silky hairs; fl. with 3 stas 
Phragmites. 633. 
— Spikelets without silky hairs; the 2^1ateral (lower) fls male, 
with 3 stas, the central (upper) fl. hermaphrodite, with 
2 stas.Hierocliloa. 621. 
54. Lower branches of the panicle solitary (altern.), terminated, 
like the secondary branches, by clusters of crowded spike¬ 
lets .Dactylis. 651. 
— Branches of the panicle solitary or in pairs, or whorled. 
Spikelets not crowded ...... 55 
55. Some, at any rate, of the fls awned . . . 56 
— None of the fls awned ...... 64 
56. Spikelets with 2 fls, one of which is male . . 57 
— Spikelets with 2—several fls, all hermaphrodite . 58 
57. The upper fls male. Awns short . . Holcus. 637. 
— The lower fl. male. Awns long. . Arrhenatherum. 638. 
58. Lower glumella with an awn at the middle or base of its 
back. 50 
— Lower glumella with an awn at the top or, when this is 
incised, in the incision ...... 61 
