11. DESCRIPTION OF PLATES. 



MILLIUM. a M. effusum, n. in. I Spike! ct closed c Spikelet open, d Ovary 

 and pistils. 



AJIPHICARPUM. f A. Purshii, n. m. / Leaf. $ Staminate flower, of the pan- 

 icle. $ Pistillate flower, of the root. 



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

 let, d Fertile pales, x Neutral pales. 



OPLISMENUS. o 0. Crus-galli, dim. a Spikelet m. 6 Spikelet of /3 mutieus. 



SETARIA. a S. viiidis. b Spikelet in, with its bristly iuvoluere. c Spikelet 

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



CENCHRUS. <t C. tribuloides, the burr4ike involucre, b Spikelet. c Pales in 

 fi uit d Pales in flower. 



PIIALAIUS. a P. arundinacea in. 6 Flower, and the 2 hairy rudiments at base. 

 e P. Canariensis, spikelet. 



ANTIIOXANTIIUM. a A. odoratum, spikelet m. b The 2 awned rudiments. 

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



HIERCCHLOA. a H. borealb, u, 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. in. 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, c? Upper pale. 



A VENA. <z A. elatior, spikelet n. m. g Glumes, f Flowers, p A. praecoz, 

 spikelet n. m. 6 Glumes, c Flowers. 



TRISETUM. a T. palustre, spikelet, n. m. b Same m. c Pales of the lowest 

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



BROMUS. * B. secalinus, spikelet, n. m. a A flower, b B. ciliatus, spikelet 

 before flowering; n. m. c A. flower open. 



TRICUSPIS. s T. seslerioides, n. m. a Spikelet. m Lower pale of flower. 

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



URALEPIS. a U. purpurca, n. m. b Spikelet m. c Lower pale, d Grain. 

 e Upper pale. 



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



KOELERIA. c K. ci-istata, n. m. a Spikelet. b Flower. 



DIAURHENA. a D. diandra, n. m. 6 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. c 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. f Same m. 



