ZOYSIE^. 65 



ligiile 3-6 mm. long, decurrent ; blades rigid, rough, 20-40 cm. 

 long, 4-6 mm, wide. Panicle simple, erect, narrow, 20-40 cm. 

 long, rays in pairs ; spathes yellowisli green, 4-5 cm. long, seta- 

 ceously acuminate, usually longer than the racemes. Racemes 2.5 

 cm. long, erect, bearing 1, rarely 2 fertile spikelets, two staminate 

 spikelctsand other neuter spikelets. Fertile spikelets 11 mm. long, 

 linear-oblong on a callus 4 mm. long, first glume firm, 2-pointed, 

 grooved on the back, 6 mm. long, besides the short awn which is 

 2-3 mm. long; second as long as the first, deltoid, obtuse, 3- 

 nerved; third shorter, fourth 4 mm. long, bearing an awn 5-0.5 

 mm. long. Pedicellate or staminate spikelets 11-15 mm. long, on 

 filiform pedicels, first glume about 13-nerved, second 3-nerved, 

 third and fourth 1 mm. long, narrow and ciliate on the margins. 

 Anthers 3.5 mm. long. 



Mexico (Eio Blanco), Palmer 313, in 1886 ; also found in tropi- 

 cal Africa. 



Teibe III.— ZOYSIE^. 



Spikelets solitary, or often in groups of 2-6 at each joint of the 

 main axis, each group falling off entire from the continuous rachis. 

 Spikelets usually 1-flowered, the floral glume awnless (awned in 

 kScJinffnera), membranous ; empty glumes firmer and often awned, 

 the first usually the largest. Palea usually shorter than its glume, 

 sometimes 0. Stamens 3 or fewer. Style free, stigmas plumose. 

 Embryo nearly half as large as the unfurrowed obcompressed 

 grain. 



A. Groups of spikelets usually numerous, in solitary, terminal 



spikes or racemes. 



a. Spikelets 3-4 together, each group surrounded by an in- 

 durated false involucre consisting of the first glume of each 

 spikelet (15) 



a. Spikelets ternate, strictly sessile, the outer ones 2-flowered, 

 staminate, the inner 1-flowered, pistillate or perfect. (16) 



a. Spikelets 2 to 6 together, the groups distinctly pedi- 

 cellate (h) 



