AXI)KOl'U(JONE.E. 49 



long, dense, reddish green; joint cuneate, a tliird shorter than the 

 spikelets, with wliite spreading hairs on tlie edges, the iqicx 1 mm. 

 wide. Sessile spikelets whitish, 4-5 mm. long: first glume linear- 

 oblong, obtuse, '^-tootlied ; margins firm, involute, hairy; second 

 glume as long as the first! obovate-truneate. compressed, ciliate, 

 bearing an awn 3-4 times its length between the two very sliort 

 teeth; third linear, the oblong margins involute, ciliate; fourth 

 elliptical, half as long as tlie second, ciliate, the awn 3. 5-4. 5 cm. 

 long; palea one third shorter than its glume. Anthers 1. Smm. 

 long. Pedicellate spikelets twice as long sis the fertile ones, tinged 

 with red; first glume herbaceous, obovate-falcate. flattish. abruptly 

 acute, with 15 or more nerves, ciliate, bearing a slender awn its own 

 length ; second glume half as long as the first, ovate-lanceolate, with 

 a slender awn half its length or longer. Stamens 0. 



Mexico. Pahner r.iW, Prinfjlc; Cuba, Wrinhl :U83. 



Found in Mexico, Cuba, (Jentral xiUierica lo Brazil, tropical 

 Africa, India. 



11. A. brachystachyus Chapm. Fl. S. States, Suppl. (iCS (1880). 



C'uhrs 100-150 cm. high, with numerous very slendei- branches, 

 each bearing two short spikes. Leaf-blades snuwtli. the lower 30 

 cm. long, 3 mm. wide, the upper reduced to nicre short tlireads. 

 Spikes mostly in})airs. siender, zigzag, 1-2 cm. long, the hairs of the 

 rachis and pedicels extending beyond the spikelets. First glume of 

 the sessile si)ikelet lanceolate, 2-keelod, "^-nerved, 4 mm. long; 

 second rarely as long, compressed, 1-nerved; third shorter, hyidine; 

 fourth very luirrow. bearing a twisted awn 1 cm. long. Pedicels 

 bearing no spikelet. 



Floridii. rV/7/,s>' 3(532. 



VI. A. arctatus ('hai)m. Coult. Bot. Gaz. 3 : 20 (1878). 



An erect, smooth perennial, branching above the middle. 

 Culms hard, cylindrical. Sheaths shorter than the inteniodcs; 

 l)lades 10-15 cm. long, 2-3 mm. wide, often involute. Spikes in 

 pairs, 2-4 cm. long, the terniimd pair barely exserted, the lateral 

 with its V)ase enclosed by a sheath, ihe tip of which seldom reaches the 

 apex of the si)ikes; rachis and ]H'dicels clothed with soft white hairs 

 extending beyond the spikelets. Sessile spikelet lanceolate, 5 mm. 



