TWEXTY-FIRST ANNUAL MEETING. 



91 



€7. Flowers in simple or paniculate spikes, spikelets in pairs (one pedicillate) 



in the alternate notches of the rachis 2 Andropogon. 



67. Flowers not as ahove (69). 



68. Spikelets in a simple racemose panicle, outer glumes minute, the upper 



about half a line long, palet hyaline and bifid at the apex Hi Brachyelytrum. 



68. Not as above (69). 



69. Spikelets one-flowered, with a bristle-like or pedicillate hairy rudiment op- 



posite the palet 23 Calamagrostis. 



69. Not as above (70). 



70. Palet about as long as the flowering glume, and of the same texture 15 Muhlenbergia. 



70. Palet shorter than the flowering glume, or wanting (71). 



71. Inflorescence in simple or paniculate spikes 2 Andropogon. 



71. Inflorescence paniculate (72). 



72. Spikelets one-flowered, flowering glume awned on the back 22 Agrostts. 



72. Fertile spikelets one-flowered, sessile between two pedicillate sterile spike- 



lets at the end of the slender branches of the panicle 2 Andropogon. 



73. Palet ciliate on the keel and apex, the lateral nerves of the outer glumes 



vanishing within the scarious margin 43 Melica. 



73. Palet (and glumes) sparingly ciliate, hyaline, glumes with hyaline mar- 

 gins 2 Andropogon. 



73. Palet not as above (74). 



74. Lower glume narrow-keeled, the second broadly obovate not keeled, 3- 



nerved. scarious-margined, flowering glumes oblong 41 Eatonia. 



74. Lower glume narrow, the second ovate, 5-nerved, keeled, flowering glumes 



broadly ovate, rigidly coriaceous 44 Diarrhena. 



74. Not as either of the above (75.) 



75. Flowers with a tuft of hairs at base (76). 



75. Flowers destitute of a tuft of hairs (77). 



76. Outer glumes nearly equal, rigid, 5-nerved, palet sulcate between the keels, 24 Ammophila. 



76. Outer glumes unequal, thinly membranaceous, palet 2-toothed 23 Calamagrostis. 



77. The perfect flower of the spikelet closed coriaceous or cartilaginous, stigmas 



usually purple i 5 Panicum. 



77. Flower not as above (78). 



78. Palet shorter than the flowering glume, frequently reduced to a small scale 



or wanting, outer glumes nearly equal or the lower rather longer 22 Agrostis. 



78. Palet about equaling the flowering glume; and of the same texture (79). 



79. Flowering glume with a very short usually hairy callus, mucronate or awned, 



outer glumes from small or minute to nearly as large as the flowering 



glume, persistent, sometimes bristle-pointed 15 Muhlenbergia. 



79. Flowering glume destitute of a callus and unawned, outer glumes unequal, 



the lower one shorter, often acute, but really unawned 19 Sporobolus. 



80. Spikelets with one terminal perfect flower, the flowering glume more or less 



concave, becoming indurated, embracing the short palet. which is of the 



same texture 3 Paspalum. 



80. Spikelets with one perfect terminal flower, and usually a second (staminate 

 or rudimentary) one below, glume of the terminal flower with its palet 

 usually of a coriaceous texture 5 Panicim. 



1. Tbipsacum L. 



a. Spikes 4 to 8 inches long, at the summit and from upper sheaths 1 



1.* Tripsacum dactyloides L.; Gama grass, Sesame grass. 



2. Andropogon L. 



a. Panicle terminal and narrowly oblong (6-12 inches), yellowish or russet 9 



a. Peduncle solitary, bearinga single spike 2 



'/. Spikes more numerous (6). 



b. Culms bushy — branched at summit, spikes in thick, leafy clusters 4 



b. Culms, etc., not as above (c). 



* The species, with corresponding numbers, also descriptions, are given in " The Native Grasses of 

 Kansas," in the Quarterly Report of the State Board of Agriculture, March, 1889. 



