DESCRIPTIONS OF TRIBES AND GENERA. 129 



Its rhizome (Rh. Graminis ItdLici) is used in medicine 

 like that of the Paspalum distichum (see p. 73). 



170. (19) Spartina Schreb. (Trachynotia Michx., Lim- 

 netis Pers., Solenachne Steud.). Spikes two to several, 

 usually upright, approximate, rarely remote ; spikelets 

 large, compressed ; empty glumes unequal ; as long or 

 nearly as long as the flowering glume ; embryo nearly as 

 long as the fruit. 



Species seven. Maritime grasses, three of which are 

 common to the Atlantic coast and to the Mediterranean 

 shores (Sp. stricta Both) ; two in the Western prairies, 

 one in Montevideo, one upon Tristan da Cunha, Amster- 

 dam, St. Paul. Coarse grasses, of not much value as 

 fodder. 



171. (169) Schoenefeldia Kunth. Spikes 2-4, long. 

 Spikelets densely crowded, sub-pectinate. Striking in 

 appearance on account of the very long slender awns 

 which impart to the spikes an elegant crinate aspect. 



Species three, tropical Africa ; one East Indian. 



172. (171) Harpechloa Kunth. Spikelets crowded, 

 pectinate ; flowering glumes of flower broad, com- 

 pressed, obtuse, long-fringed ; above the 9 flower are 

 1-3 small glumes that are either empty or with $ flow- 

 ers ; spikes dense, often falcate. 



Species two (H. capensis Kunth), in South Africa. 



173. (172) Ctenium Panzer (Campidosus Desv., Mono- 

 cera Ell.) (Fig. 68). Spike one, rarely 2-3, usually 

 curved ; spikelets densely imbricated, pectinate ; second 

 empty glume awned on the back ; awn stout, divergent ; 

 flowering glume of $ flower with a very slender awn 

 below the point ; one to two empty or $ bracts above 

 the flowering glume. 



Species seven, four in South and North America, 

 three in Africa and the Mascarene Isles. 



174. (173) Enteropogon Nees. Spikes long, often 

 curved ; spikelets imbricated ; flowering glume of the $ 

 flower with a slender awn below the point ; 1-2 empty 

 or $ bracts above. 



Species four, in East India, tropical Africa or the 

 Mascarene and Seychelles Islands. 



