92 THE TRUE GRASSES. 



let ; caryopsis unfurrowed ; embryo small ; starch-grains 

 compound. 



A. The third and fourth (or only the fourth) empty glumes 

 larger than thejirst and second. 



a. Stamens six, rarely three. . . . 94. Ehrharta. 



b. Stamens four or two. 



a. Panicles loose, third and fourth empty glumes 

 equal, awned 95. Microlaena. 



/?. Inflorescence a spike or spike-like panicle. 

 Fourth glume longer than the third, awnless. 



96. Tetrarrhena. 



B. Third and fourth empty glumes smaller than or barely 

 equalling thejirst and second. 



a. Third and fourth glumes empty, reduced to small 

 scales, awiiless 97. Phalaris. 



b. Third and fourth glumes empty, small, awiied upon 

 the back 98. Anthcxanthum. 



c. Third and fourth glumes, or at least the third, with 

 a $ flower, almost equalling the first and second, 

 awnless or short-awned. . . . 99. Hierochloe. 



94. (99) Ehrharta Thunb. (Trochera Eich.) (Fig. 39). 

 Spikelets arranged in panicles or simple racemes. First 

 and second empty glumes short, the third and fourth fre- 

 quently awned ; flowering glume slightly shorter, keeled, 

 with a callus or tuft of hairs at the base. 



Species twenty-four ; twenty in South Africa, two on 

 Mascarene Isles, two in New Zealand. Two have become 

 naturalized in New Holland. 



95. (100) Microlsena Brown (Diplax Hook.). First and 

 second empty glumes very short, third and fourth longer 

 than the flowering glume, all keeled ; lodicules quite 

 large ; stamens two or four. Inflorescence paniculate. 



Species five, in Australia to New Zealand. 



96. (101) Tetrarrhena Brown. Like the preceding, 

 but the spikelets in a more simple, scarcely branched 

 spike. Fourth glume largest, indurated ; stamens four. 



Species four, in Australia. 



97. (102) Phalaris L. Inflorescence usually a close 

 spike-like, rarely interrupted panicle ; spikelets later- 

 ally compressed. First and second glumes boat-shaped. 



