TABLE OF GENERA. 
xlix 
22 . Paxtcttm. Panicle close. Glumes 2, unequal, 2-flowered, 1 floret imperfect. 
Seed coated witli the paleae. 
23. Setaria. Panicle spike-like, bristly. Spikelets surrounded by bristles at the 
base. (Otherwise as Panicum.) 
24. Poa. Panicle usually loose. Spikelets rounded at the base. Glumes 2, 
pointed, with many florets. Pale® 2, ovate, awnless. Seed free. 
25. Triodia. Panicle close. Glumes 2, many-flowered. Palea; 2, broad; the 
outer one with 3 teeth. Seed free. 
2G. Briza. Panicle very lax. Glumes 2, many-flowered, swollen. Paleae 2, awn¬ 
less, obtuse; the outer one swollen. Seed depressed, attached to the paleae. 
27. Dactylis. Spikelets crowded, leaning one way. Glumes 2, unequal; the 
larger one keeled, many-flowered. Paleae pointed. 
28. Cynosurus. Panicle one-sided, spike-like, or short, with few spikelets. Spikelets 
in pairs, one fertile and one abortive. Glumes 2, with several florets. 
29. Festuca. Flowers panicled. Glumes 2, pointed, unequal. Spikelets many 
flowered, rather cylindrical. Paleae 2 ; the outer awned, the inner downy. 
Seed free. 
30. Bromus. Panicle loose. Spikelets oblong. Glumes 2, with many florets. 
Pale® 2; the outer awned beneath the cloven apex, the inner bristly. Seed 
attached to one palea. 
31. Avena. Flowers panicled. Glumes membranous, with several florets. Outer 
palea coating the seed, with a bent awn at the back. 
32. Ari ndo. Panicle loose and spreading. Glumes 2, with 5 florets, with long 
silky hairs at the base. 
33. Ef.ymus. Flowers spiked, in 2 rows, several together. Glumes 2, both on one 
side, with several florets. 
34. Horpeum. Flowers spiked, in 2 rows, 3 together. Glumes 2, both on one 
side, with 1 floret. Seed attached to the paleae. Glumes and palea both awned. 
35. Triticum. Flowers spiked, in 2 rows, their sides towards the stalk. Glumes 2, 
with several florets. Inner palea bifid. 
36. Brachypodium. Flowers spiked, in 2 rows, their sides towards the stalk, nearly 
cylindrical. Glumes 2, unequal, many-flowered. Paleae 2, awned. Seed 
loose. 
37. Lolium. Flowers spiked, in 2 rows. Glume 1, fronting the stalk, many- 
flowered. 
38. Lepturus. Flowers in an awl-shaped spike. Glumes 2, united below. Florets 
imbedded in the stalk. 
39. Knappia. Flowers spiked, in 2 rows. Glumes 2, obtuse, 1-flowered. Paleae 2, 
very hairy. 
40. Spartina. Flowers spiked, in 2 rows, on one side of the stalk. Glumes 2, 
compressed. Paleae 2, compressed. Styles united. Seed free. 
41. Cynodon. Spikes linear, 3-5 together on the top of the stalk. Seed coated 
by the paleie. 
42. Digitaria. Flowers spiked, in pairs, on one side of the flattened stalk. Spikes 
several together on the top of the stalk. Seed coated by the paleae. 
Genera added in Appendix. 
Order XIII. 
14* Alsine. (See Aren aria.) 
Order XXXVII. 
3*. Astrantia. Umbels simple. Involucrum as long as umbel. Fruit oblong, 
with 5 wrinkled ridges. 
