11. DESCRIPTION OF PLATES. 



Millium. a M. effusum, n. m. 6 Spikelet closed, c Spikelet open, d Ovary 

 and pistils. 



Amphicarpum. f A. Purshii, n. m. I Leaf. S Staminate flower, of the pan- 

 icle. S Pistillate flower, of the root. 



Panicum. a P. agrostoides, n. m. b Spikelet. c P. pauciflorum n. c Spike- 

 let. d Fertile pales, x Neutral pales. 



Oplismenus. o O. Crus-galli, dim. a Spikelet m. 6 Spikelet of (3 muticus. 



Setaria. a S. viridis. 6 Spikelet m, with its bristly involucre, c Spikelet 

 of the same in flower, showing two of the bristles. 



Cenchrus. a C. tribuloides, the burr-like involucre. 6 Spikelet. c Pales in 

 fruit, d Pales in flower. 



Phalaris. a P. arundinacea m. b Flower, and the 2 hairy rudiments at base. 

 c P. Canadensis, spikelet. 



Anthoxanthum. a A. odoratum, spikelet m. 6 The 2 awned rudiments, o 

 The perfect flower, 2 pales, 2 stamens, 2 styles. 



Hierochloa. a H. borealis, n. m. b Spikelet. c Same, with the glumes re- 

 moved, showing the 3 flowers. 



Holcus. a H. lanatus, n. m. b Spikelet m. c The two flowers separated 

 from the glumes. 



III. 



Aira. c A caespitosa n. m. a Spikelet. b Flower, d A. flexuosa, spikelet 

 n. m. e Part of the same magnified. 



Danthonia. a D. spicata n. m. b Spikelet m. c Lower pale, d Upper pale. 



Avena. a A. elatior, spikelet n. m. g Glumes, f Flowers, p A. praecox, 

 spikelet n. m. b Glume3. c Flowers. 



Trisetuxi. a T. palustre, spikelet, n. m. b Same m. c Pale6 of the lowest 

 flower, p T. purpurascens, spikelet, n. m. g Glumes, d A fluwer, closed. 



Bromtjs. s B. secalinus, spikelet, n. m. a A flower, b B. ciliatus, spikelet 

 before flowering, n. m. e A flower open. 



Tricuspis. s T. seslerioides, n. m. a Sj^ikelet. m Lower pale of flower. 

 n Upper pale, st T. stricta, spikelet enlarged 2 diameters. 



Uralepis. a U. purpurea, n. m. b Spikelet m. c Lower pale, d Grain. 

 « Upper pale. 



Dactylis. a D. glomerata, n. m. b Spikelet in flower. 



Koeleria. c K. cristata, n. m. a Spikelet. b Flower. 



Diarrhena. a D. diandra, n. m. b Spikelet. c Flower. 



Festuca. a F. tenella, spikelet, n. m. b Same m. c F. nutans, spikelet, n. 

 m. d Flower. 



Eatonia. a E. obtusata, spikelet n. m. b Same m. c Lower flower, d Upper 

 flower, with an empty pedicel. 



Melica. e M. mutica, spikelet n. m. f Pales of a flower. 



IV. 



Eragrostis. a E. poaeoides, spikelet n. m. b Same m. e Pales of a flower. 

 d Grain, e E. hirsuta, spikelet n. m. / Same m. 



