EXPLAXATION OF PLATE XIII. 



HIEKOCHLOA. — (1 ) A spikelet of H. horealis, enlarged ; (2) the same dis- 

 played, the flowers sejjarated from tlie empty glumes, the two lateral ones 

 witli 3 stamens and no pistil, the middle or terminal one with a pistil and 

 only 2 stamens. 



ANTHOXANTHUM. — (1) The spike-like inflorescence of A. odoratum ; 



(2) a spikelet magnified ; (3) another with the parts displayed, the flowers 

 raised from the lower empty glumes, the lateral glumes empty and awned, 

 the terminal flower jierfect and diandrous. 



PIIALARLS. — (1) A spikelet of P. arundinacea, enlarged, (2) the empty 

 glumes, and a perfect flower witli a hairy rudiment on each side of it. 



MILIUM. — (1) Portion of the panicle of M. effusum ; (2) a closed sjjikelet, 

 magnified; and (3) the same displayed. 



AMPHICAKPUM. — (1) A spikelet from the panicle of A. Purshii, magni- 

 fied; (2) the same, witli the parts displayed; and (3) a radical (fertile) 

 spikelet, enlarged. 



PA8PALUJNL — (1) hiflorescence of P. lajve ; (2) a closed s])ikelet, enlarged ; 



(3) the same witli the parts dis})layed. 



PANICUM. — (1) Part of a spike of P. sanguiiiale; (2) one of its siiikelets, 

 magnified ; (3) tlie same with its parts displayed, the three lower glumes 

 empty. — (4) A sjiikelet of P. capillare, magnified ; (5) the same displayed, 

 the three lower glumes empty. — (6) A spikelet of P. clandestinum, mag- 

 nified; (7) the same displayed, the lower floAver represented hy a glume 

 and palet only. — (8) A spikelet of P. virgatum, magnified; (9) the same 

 displayed, tlie lower flower staminate. 



SETAKIA. — (1) A magnified spikelet of S. glauca, with the accompanying 

 cluster of bristles; (2) the spikelet displayed, showing the neutral lower 

 flower, of a glume and palet only, and the perfect flower. 



