16 



70. Valve muticous or mucronate, usually hairy. Glumes 



subequal, longer than the floret. (See also 6-i) ... 



Agrostis lachnantha. 



Valve not as in 70. At least one of the glumes shorter 



than the floret Sporobolus. 



71. Tall reed grasses, growing in or near water (Tribe 



Arundineae) 72 



Not reed grasses 73 



72. Lowest floret like the rest, hairy from the back of the 



valve Arundo donax. 



Lowest floret male or barren, hairy from the long slender 

 callus only Phragmiles communis. 



73. Blades transversely veined (Tribe Bambuseae) ... 



Anmdlnaria tesselata. 

 Blades not transversely veined 74 



74. Valves cleft into 4 or 9 lobes (Tribe Pappophoreae) ... 75 

 Valves not cleft into 4 or 9 lobes 76 



75. Valves cleft into 4 lobes with 5 awns from the sinuses ... 



Schmidtia bulbosa. 

 Valves cleft into 9 subulate, awn like lobes. Emieapogon. 



76. Spikelets of 2 kinds, fertile surrounded by sterile con- 



sisting solely of bracts 77 



Spikelets not of 2 kinds, etc 78 



77. Barren bracts obtuse, membranous ... Lamarckia aurea. 

 Barren bracts very narrow, rigid, acute or awned ... 



Cyuosuriis echinatus. 



78. Lower 1 or 2 florets fertile, upper 2-3 valves empty, 



enclosing each other forming a club or spindle shaped 



body JVIelica. 



No club or spindle shaped body 79 



79. Valves 3 nerved 80 



Valves 5-11 nerved 91 



80. Whole panicle dense, cylindrical, and usually dark 



purple. Glumes, valves, and pales equally hairy all 



over Stiburus alopecuroides. 



Glumes, valves, and pales not all equally hairy, etc.... 81 



81. Valves awned or mucronate 82 



Valves awnless and not mucronate 87 



82. Lowest 2 florets fertile, upper 2-4 barren, forming a tuft 



of awns Lophacme digitata. 



No tuft of barren awns at the top 83 



83. Lower floret awnless. Valve of upper floret with a bent 



awn. (See also 94) IIolcus. 



Awns straight 84 



