6 
Third class. 
59. Lower glumella truncate-denticulate at the top. Spikelets 
small.Deschampsia. 636. 
— Top of the lower glume 2-dentate or 2-fid . . 00 
60. Fr. pubescent, furrowed on the inner side. Spikelets fairly 
large (12—30 mm) with 2—several fls Avena. 639. 
— Fr. glabr., not furrowed. Spikelets small (5—8 mm), with 
2—3 fls. .Trisetum. 640. 
— Fr. glabr., furrowed on the inner side. Spikelets very 
small, about 2 mm, with 2 fls . . . Aira. 641. 
61 (58). Lower glumella shortly 3-toothed or 3-fid at the top, 
with a long awn in the notch. Glumes as long as the 
spikelet ....... Danthonia. 642. 
— Lower glumella not 3-toothed. Glumes shorter than the 
spikelet ......... 02 
62. Stigs inserted below the top of the ovary Bromus. 656. 
— Stig. (rel. style) inserted at the top of the ovary . 03 
63. Stig. red ....... Molinia. 650- 
— Stig. uncoloured ..... Festuca. 655. 
64 (55). Spikelets with clavate rudiments of suppressed fls 
Melica. 643. 
— Spikelets with the fls all complete . . . 05 
65. Spikelets rounded-cordate, on slender quivering pedicels 
Briza. 644. 
— Spikelets oblong, lanceolate or linear . . . 00 
66. Lower leaf-sheaths covering the nodes, whence the stem 
appears inarticulate .... Molinia. 650. 
— Lower leaf-sheaths not covering all the nodes . 6*7 
67. Axis of the spikelet, as also the upper glumella, persistent. 
Spikelets narrow, many-fld, Cyperus-like Eragrostis. 645 
— Fls of the spikelets detaching themselves by joints 08 
68. Ann. pis, the spikelets with short, thick pedicels. Glumes 
almost equal ...... Scleropoa. 653. 
— Perenn. pis ........ OO 
69. Spikelets 2-fld. Pis growing in or near water 
Catabrosa. 649. 
— Spikelets with many fls ..... 70 
70. Fr. adherent to or united with the glumellas (except F. 
sylvatica). Lower glumella pointed or acuminate Festuca. 655. 
— Fr. free. . 71 
71. Lower glumella with a rounded back and obtuse or trun¬ 
cate tip. Pis preferring the water . . Glyceria. 648. 
— Lower glumella keeled, pointed or acuminate Poa. 647. 
72 (9). Glumellas more or less distinctly distichous . 73 
— Glumellas irreg. imbricate ..... 71 
73. Spikelets united in a fascicle or corymb, with 20—30 fer¬ 
tile glumellas . .' . . . . Cyperus. 599. 
— Spikelets in a head, glumellas 6—9, the lower ones barren 
Schcenus. 600. 
