DESCRIPTION OF PLATES 

 ILLUSTRATING THE GENERA OF GRAMINE/E. 



I. 



LEERSIA, a, L. orizoides, a raceme, b, spikelet, an open flower, c, a spikele* 

 (flower) of L. lenticular is. d, Flower open, e, Ovary and stigmas. 



ZIZANIA. a Z. aquatica, stamiaate flowers, natural size (n. in.). & A staminate 

 flower, enlarged (m). d A pistillate flower, m. with one stignm visible and one 

 long-awned pale. 



AGROSTIS. a A. vulgaris, spikelet, m. with glumes and pales. 6 The flower 

 -w itli its 2 pales, 3 stamens and 2 styles, c A. scabra, 2 glumes, m. d Flower 

 witli 1 pale, 3 stamens, and 2 styles. 



SPOROBOLUS. S. asper, a spikelet m. b The graio. c S. Ipngifolius, epikolet. 

 in. d Grain. 



CIXNA. a C. pendula, a spikelet m. open. 6 C. arundinacea, a spikelet m. open, 



MUHLENUERGIA. a M. Mexicana, spikelet m. b M. sobolifera, spikelet m. s M. 

 sylvatica, spikelet m. w M. Wildeuowii, spikelet m. d M, diffusa, spikelet ro. 

 g The 2 small glumes 



POLYPOGON. a P, Monspeliensis, panicle, diminisnoc! (dha.), b A spilieletv 

 with glumes, <fee. c Flower with'pales, stamens and styles, 



CALAMAGROSTIS. a C. confinis, spikelet m. b A flower the 2 pales, ovary and 

 2 styles, c C. Canadensis, spikelet m. d Grain. 



ALorEcuaus. a A. aristulatus, spikelet m. b Lower pale, c Ovary and 2 

 styles, d A. pratensis, spikelet m. e Lower pale. / A. genieulatus, spikelet m, 



PHLEUM. a P. pratense, spikelet m. b The 2 pales and ovary. 



ARISTIDA. a A. dichotoma, spikclets n. m, b A single spikelet rn. e A. pur- 

 purascens, spikelet m. d A. tuberculosa, pale n. m. with its 3 large twisted and 

 bent awns. 



STIPA. a S. avenacoa, spikelet. 5 pale with the long twisted and bent awn, 

 D. m. c Flower, m. with 3 stamens, ovary, 2 styles, 



II. 



ORYZOP$IS. a 0. asperifolia, n. m. b Spikelet, m. m 0. melanocarpa, spike* 

 let m. showing the black fruit. 



PASPALUM. p P. laeve, n. m. a Spikelet, m. b Spikelet, with its true glume 

 open, d Paspalum sanguinale, n. m. a spike, c A spikelet, showing the glume 

 in front, d A pale. 



