ANDROPOGONEiE 53 



18. A. Floridanus S('i-il)ii. iiied. 



Culms subterete, branching much near the top, 90-120 cm. 

 high. Upper sheaths slightly inflated, those of the extreme apex 

 narrow and extending to the base of the spikes. Spikes in pairs, 

 sessile, zigzag, 3-4 cm. long; lateral pedicels a little shorter and 

 stouter than those of A. Virginicus. The whole plant is some- 

 what intermediate between A. Virginicus and A. macrourus, with 

 which this has been somewhat hastily compared. Low pine land. 



Florida, G. V. Nash, 1573, IGSl, in 1894. 



19. A. Leibmanni Hack. Flora 132 (1885). A. macrothrix, 

 Fourn. Mex. PI. Enuni. Gram. 60 (1886). 



Culms brandling sparingly above, 15-20 cm. high. Leaf- 

 blades smooth, with a few soft hairs, 2-5 cm. long, 2-3 mm. wide. 

 Spikes exserted or enclosed, 3-4 together, simple or branching, 2-3 

 cm. long, hairs of the rachis and pedicels exceeding the spikelets. 

 The 2 outer glumes of the sessile spikelet membranous, ovate-acute, 

 3 mm. long, first 2-keeled, 2-nerved, second 1-keeled, third and 

 fourth hyaline and shorter, the awn of the latter 15 cm. long. 

 Stamen 1. Sterile spikelets 2 mm. long on pedicels 3 mm, long of 

 one to two glumes. 



Mexico, Bourgean 2376, Palmer 227 ; Texas, Nealley, sent out 

 by him as A. macrourus Michx. var. immilus Vasey. 



Var. Mohrii Hack. D. C. Monog. Phan. 6 : 413 (1889). 



Plant (especially the sheaths) clothed with numerous soft hairs. 

 Culm 90-120 cm. high, with maiiy branches above. The lower 

 blades 60 cm. long, 5 mm. wide, the upper becoming mere 

 sheaths partially enclosing 3 or more slender spikes. Pedicels 4 

 mm. long. Sessile spikelets 4 mm. long, awn 2 cm. long. 



Alabama, Mohr. 



20. A. longiberbis Hack. Flora 68 : 131 (1885). A. fpfra- 

 stachyus, var. distachyus Chapm, Fl. S. States, 581 (1860). 

 A tufted perennial, sparingly branched above, 60-80 cm. high. 

 Sheaths silky hairy, those on the middle of the culm half as long 

 as the internodes; blades flat, smooth, or with a few silky hairs 

 below, 2-4 mm. wide. Spikes mostly in pairs, about 3 cm. long, at 

 length protruding from the sheath, which is 3.5-5 cm. long; apex 



