DESCRIPTIONS OF TRIBES AND OENERA. 



133 



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

 F. Mull, 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. Arabica 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 aAvnless. 



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

 Southern Europe, temperate portions of Asia and North 

 America. [Specimens from America have one-flowered 

 spikelets.] 



Fig. 71. — A, Eleusine Corucana 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 



