GRAMINEE. (GRASS FAMILY.) 547 
+ + Lower palea entire, awnless or (in No. 33) awn-pointed. 
++ Glumes unlike, the lower one linear, the upper obovate. 
26. EATONIA. Spikelets 1-5-flowered. Culms slender, tufted. 
++ ++ Glumes alike. Lower palea rounded on the back, not keeled. 
27. MELICA. Spikelets 8-5-flowered. Lower palea many-nerved. 
28. GLYCERIA. Spikelets 5-many-flowered. Lower palea strongly 7-nerved. 
29. ARUNDINARIA. Spikelets loosely many-flowered. Culms woody. 
90. BRIZOPYRUM. Spikelets dicecious. Lower palea rigid. 
++ ++ ++ Glumes alike. Lower palea keeled. 
81. POA. Pales falling AP together, the lower one 5-nerved, and with Nbwridbiy hairs at 
the base. Spikelets 3 — 6-flowered. 
82. ERAGROSTIS. Lower palea falling before the upper one, 3-nerved, not hairy. 
83. DACTYLIS. Lower palea awn-pointed. Panicle contracted, composed of Lsided clusters. 
* * Grain adherent to the upper palea, downy at the apex. 
34. FESTUCA. Lower palea entire, acute or awn-pointed. 
35. BROMUS. Lower palea 2-cleft, awned between the teeth. 
* * * Grain free, smooth. Lowest flowers of the spikelet imperfect. 
86. UNIOLA. Spikelets broad and fiat, many-flowered. Pales coriaceous. 
97. PHRAGMITES, Spikelets 3 - 6-flowered, Silky bearded on the rachis. Pales thin. 
Troe V. HORDEACE AS. — Spikelets 2-several- -flowered, sessile, on a sides of 
the jointed rachis, spiked. Glumes 1 - - 2, rarely wanting. - .Palee2 
98. ELYMUS. Spikelets 2-4 at each joint of the rachis.  Glumes 2, ace sido by sido petore 
the spikelets. ; 
89. GYMNOSTICHUM. Spikelets 2-3 at each joint of the. rachis. dew none. 
40. LOLIUM. Spikelet solitary at each joint of the rachis. Glume 1. 
Tamr VI. AVENACE, — Spikelets panicled, 2 - several-flowered, the terminal flow- 
ers mostly imperfect. Rachis or base of the flowers often bearded. Lower palea with a 
twisted, bent, or straight awn on the back, or below the apex. 
41. AIRA. Spikelets 2-flowered. Lower palea thin, rounded on the back, awned below the 
middle. 
42. TRISETUM. Spikelets 2-several-flowered. Lower palea thin, compressed-keeled, bear- 
ing a bent awn below the 2-cleft apex. 
43. DANTHONIA. Spikelets 2-several-flowered. Lower palea rigid, many-nerved, bearing 
a flattened and twisted awn at the 2-cleft apex. - 
44. ARRHENATHERUM. Spikelets 2-flowered, the lower flower staminate, and pone a 
long bent awn below the middle. 
Tazz VII. PHALARIDE J. — Spikelets in spits sialic ibo ad NM 
or middle flower perfect, the two lateral ones imperfect or mere rudiments. Glumes 2. 
Paleze 2, indurated in fruit. = 
45. ANTHOXANTHUM. Lateral flowers neutral, each of one awned palea. Perfect flower 
16. PHALARIS. Lateral flowers rudimentary. Perfect flower triandrous. 
Teee VIII. PANICEZE.-— Spikelets 2-flowered. Glumes 2, or the lower wanting. 
Lower flower imperfect, either staminate or neutral, with the lower palea membrana- 
ceous and similar to the upper glume, the upper one mostly wanting. Pales of the 
perfect flower coriaceous. eee ee new: 
in spikes or panicles. ARE 
Heute oic canam re amd: 
— . single flower, with 2 glumes and 2 palee). — 
: (Ss. PASPALUM. Lo ume! com Ree 
