DESCRIPTION OF PLATES. 1U 



POA. a P. dinantha, n. m. b Spikelet m. c Flower, d P. debilis, n. m. 

 e Spikelet m. / Flower. 



BBIZOPYRUM. a B. spicatum, $ , n. m. b Spikelet ? , a m. c Spikelet $ , n. 

 m. d Flower $ open, e A stamen of $ . 



GLYCERIA. a G. aquatica, n. m. 6 Spikelet m. c Flower, d G. Canadfinsis 

 n. m. e Spikelet m. f A pale. 



BEIZA. a B. media, dim. b Spikelet n. m. c Flower. 



UNIOLA. a U. latifolia, spikelet n. m. b Flower, e Glumes, d 17. graeilis, 

 D. m. e Spikelet m. 



PIIRAGMITES. a P. communis, spikelet n. m. b A flower open. 



ARUNDINARIA. a A. macrosperma, spikelet a m. 6 Flower, e Same with 

 fruit. 



LEPTURUS. a L. panieulatus, dim. b Raceme n. m. c Spikelet in flower, m. 



HORDEUM. a H. jubatum, half size, b Spikelet n. m. 



ELYMUS, a E. Virginicus /? arcuatus, spikelet n. m. b E. Canadensis, spikelet 

 n. m. c Flowers, d E. Hystrix, spikelet n. m. 



LOLIUM. a L. perenne, n. m. b L. temulentum, spikelet a m. e Flonrez 

 open, m. 



V. 



TRITICUM. a T. repens, D. m. b A flower, c T. vulgare, spikelet D. m, 

 4 Ovary, scales, and styles. 



LEPTOCIILOA. a L. faseicularis, braoch, n. m. b Spikelet. e L, filiformia, n. nx 

 d Spikelet. 



GYMNOPOGON. a G. racemosum, branch, n. m. b Glumes, e Pales, d G, fil- 

 iformis, branch, n. m. e Spikelet m. d Spikelet closed. 



CYNODON. a C. Dactylou, dim. c Spikelet in flower, b Portion of srpike. 

 d Glumes. 



ELEUSINE. a E. Indica, am. b Spikelet m. c Spikelet in fruit 

 SPARTINA. a S. polystachia, branch, am. b Spikelet. e Flower without the 

 pales. 



BOUTELOUA. c B. curtipendula, D. m. a Spikelet. b B. hirsuta, spikelet. d The 

 abortive flower. 



TRIPSACUM. a T. dactyloides, D. m., $ pistillate flowers. $ staminate flowers. 



ROTTB<ELIA. b. R. rugosa, n. m. c A joint of the spike with one sessile, fer- 

 tile spikelet, and one pedicelled, abortive spikelet. 



STENOTAPHRUM. c S. dimidiatum, under side of the spike. 



CTENIUM. a C. aromaticum, n. m. b Spikelet in fruit. 



ERIANTHUS. a E. alopecuroides, a joint of the rachis and spikelet, n. m, 

 b Spikelet m., in fruit, c E. brevibarbis, spikelet and joint of rachis, n. m, 



ANDROPOGON. a A. scoparius, several spikelets, D. m. b One spikelet, m., 

 with a joint of rachis. e A. Halei, 2 spikelets, am. d Spikelet, m., with a joint 

 of rachis. 



ZEA. a Spikelet, staminate, from the tassel, b Spikelet, pistillate and fertile 

 from the ear, with its long style. 



