(10) 



I. Lepturus. 



b. Spikelets all sessile on alternating notches 



of the rachis. 



1. Lolium. — Terminal spikelet with 2 

 glumes, lateral spikelets but one glume. 



2. Hordeum. — Spikelets 3 at each notch of 

 the rachis, 1-flowered. Fruit a caryop- 

 sis wrapped and grown together with 

 the pale?e. 



3. Eljmus. — Spikelets 3 at each notch of 

 the rachis, 2 — cjo-flowered. 



4. Gymnostichum. — Spikelets 1-3 at each 

 notch of the rachis. Glumie rudiment- 

 ary or 0. 



5. Triticum. — Spikelet 1 at each notch of 

 the rachis. Glumte 2, placed right and 

 left (not dorsal and ventral.) 



c. Spikelets pedkillate, 1-d-Jiowered, but o)ihj 



1 flower regularly developed. 



aa. SpiMets dorsal ly compressed. 



1. Panicum. — Glum?e 3, the lowermost very 

 small. Involucre 0. 



2. Setaria. — Glumse 3, the lowermost small; 

 bristly involucre below the spikelet. 



bb. Spikelets latercdly compressed. Glumas 3. 

 The tiuo inferior florets rudimentary, ter- 

 minal floret only developed. 



