EXPLANATION OF PLATE XIII. 



HIERO('!IL<>A. (1) A spikelet of II. l.orealis, enlarged ; (2) the same dis- 

 played, the flowers separated from the empty pinnies, t lie two lateral ones 

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

 only 2 stamens. 



ANTlInXAXTlirM. (1) The spike-like inHoreseenc-e of A. odoratuni; 



(2) a spikck-t magnified ; (X) another with the parts displayed, the flowers 

 rai.-ed from the lower emptv Chimes, the latei'al glumes empty and awned, 

 the terminal flower perfect and diandnms. 



I'll. \LAHIS. (1) A spikelet of 1'. arundinacea, enlarged, (2) the empty 

 plumes, and a perfect flower with a hairy rudiment on eaeli side of it. 



MILIUM. (1) Portion of the panicle of M. effnsnm ; (2) a closed spikelet, 

 magnified ; and (3) the same displayed. 



AMIMIK'AIMTM. (1) A spikelet from the panicle of A. Pnrshii, magni- 

 fied; (2) the same, with the parls displaced: and (.'5) a radical (fertile) 

 spikelet, enlarged. 



1'ASl'AU'M. (1) Inflorescence of P. hvve ; (2) a closed spikelet, enlarged; 



(3) the same with the parts displayed. 



PANKTM. (1) Part of a spike of P. sangiiinale ; (2) one of its spikelets, 

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

 empty. (4) A spikelet of 1'. eapillare, magnified ; (5) the same displayed, 

 the three lower glumes empty. (0) A spikelet of P. clandestinum, mag- 

 nified; (7) the same displayed, the lower flower represented l>y a glume 

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

 displayed, the lower flower staminate* 



SKTA1I1A. (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 aiid palet only, and the perfect flower. 



