DESCRIPTIONS OF TRIBES AND GENERA. 



133 



Species two or three. A. pectinata and A. triticoides 

 F. Hull, in Australia. 



187. (189) Tetrachne Nees. Spikes remote, with 

 densely crowded spikelets ; leaves terete, convolute. 



Species one (T. Dregei Nees), in South Africa. 



188. (188) Dinebra Jacq. Spikes short, numerous, 

 scattered along a common axis, finally reflexed. 



Species one (D. Arabic, Jacq.), a low annual in 

 Northern and tropical Africa to Hindostan. 



189. (6) Beckmannia Host. Spikelets broad, com- 

 pressed, crowded, two-flowered. Empty glumes navicu- 

 lar, inflated on the back ; flowering glumes narrower, 

 keeled, pointed, but awnless. 



Species one (B, erucceformis Host.). Eastern and 

 Southern Europe, temperate portions of Asia and North 

 America. [Specimens from America have one-flowered 

 spikelets.] 



Fio. 71. A, Eleusine Coracana Gartn. (After Schreber, Bschr. pi. 35.) B, S, 

 Spikelets of E. Indica Gartn. (After A. Gray, Man. pi. 9.) K, Utricle. S. seed. 



190. (191) Eleusine Gartn. Spikes digitate or rarely 

 scattered ; spikelets many-flowered, crowded ; glumes 

 closely imbricate, diverging, compressed and keeled, 

 obtuse or mucronate-pointed ; pericarp very delicate. 



Species six, mostly in the tropical and sub-tropical 



