92 PAXICACK.K. 



It. P. dilatatum I'oir. Liini. Enoyd. 5::}') (1S()4). P.nrnfiim 

 Nees, A^M'ost. Hnis. 4:5 (IS-JU). 



Culms 'J0-i:5() cm. lii^^li, yimpk". smooth. Loul'-bliulos smooth, 

 "0—40 em. loii^, 7~[) mm. \vi(k'. .S])iki's Il-T, rutlicr irmott', (J-IO 

 em. long, nieliis over I mm. wide. Spikelets in 4 rows, eom- 

 prcssetl, oviite, ueiite, pubeseent, ;).5 mm. long, lirst glume 

 5-nerved, second 3-5-nerved, third orbieuliir, ;.*.5 mm. long. 



Louisiiinu, ,1. A*. Lmujlois. 



\ar. decumbens N'tisoy, liull. Terr. Club. 13: IGO (188G). 



Culms shorter and decumbent. Spikes usually 3-4. 



•.'0. P. pubiflorum Hui»r. Hull. Hrux. 1). inirt 2.',>;}r (184;2). 

 P. Iiiillii \'asey and 8eribn., \'asey in Bull. Torr. Club, 13:05 

 (I88(i). 



Culms geniculate and rooting, branching below, nodes pubescent, 

 G0-90cm. high. Ligule firm,:.' mm. long; blades smooth, flat, lO-;.'0 

 cm. long, G-8 mm. wide. Spikes 3-G, approximate, *2-G em. long, 

 nichis l.T mm. wide. Spikelets mostly in couples, those in direct 

 lineal line distant about 'Z mm., obtuse, finely pubescent, ovate, 

 oval or obovate, obtuse, 2.7 mm. long, first and second glumes 

 3-nerved. 



Mexico (Chihuahua), Pringle 374; Texas, Nealley ; Lower 

 California, Palnwr 45. 



Alabama to Texas. 



Var. glaucum Scribn., ined. 



Glaucous; culms erect, rigid; sheaths hairy; spikelets more 

 hairy. 



Mexico (Coahuila), Pritujle 437. 



31. P. rectum Xees, Hook. Kew Journ. 3 : 104 (1850). P. 

 monostac/n/ittn Vasey, ('hapm. Fl. S. States, Suppl., 6G5 (1889). 



A smooth erect perennial, GO-00 cm. high, from creeping root- 

 stocks. Leaf- blades firm, conduplicate, 30-GO cm. long. 3-3 mm. 

 wide. Spikes erect, much exserted, mostly single, sometimes two, 

 approximate. 13-30 cm. long, raehis round on the back, slightly 

 fiexuose, about 1 mm. wide. Spikelets in pairs, those in lineal 

 rank nearly touching each other, smooth, oblong, 3.5-3 mm. long; 



