EXPLANATION OF PLATE VII. 



LEERSIA. (1 ) Panicle of L. oryzoides, reduced in size; (2) a branchlet of 

 the same, with its spikelets, of the natural size; and (3) an open spike- 

 let in flower, enlarged. 



ZIZANIA. (1) A staminate, and (2) a pistillate flower or spikelet of Z. 

 aquatica ; (3) a magnified pistil with a pair of squamulse or hypogynous 

 scales; (4) a grain, and a magnified longitudinal section of the lower 

 part of the same, showing the embryo at the outside of the base of the 

 albumen. 



ALOPECURUS. (1 ) Part of a plant of A. geniculatus, in flower ; (2) a few 

 spikelets from the spike-like inflorescence, moderately magnified; (3) an 

 open spikelet in flower, more magnified, and (4) the single flowering 

 glume detached. 



PHLEUM. A detached spikelet of P. pratense, having the flower with its 

 glume and palet raised above the empty glumes, magnified. 



HELEOCHLOA. ( 1 ) Inflorescence of H. scnanoides ; (2) a separate en- 

 larged spikelet; and (3) the same open, in flower. 



SPOROBOLUS. (1 ) A spikelet of S. cryptaudrus, magnified ; (2) the same, 

 with the flower open, raised above the empty glumes; and (3) the fruit, 

 more magnified, showing the seed loose in the pericarp (utricle). (4) An 

 enlarged spikelet of E. vaginaeflora ; and (5) the same displayed. 



AGROSTIS. (1) Panicle of A. alba, var. vulgaris, with (2) an enlarged 

 open spikelet of the same ; also (3) the rough pedicel and glumes of 

 A. scabra, with the flower separated, the latter having no palet. 



