FESTUC'E.E. 51S. 



smooth, longer than the interuoiles, the brown margins at the 



tliroat rovolute; ligule 1 mm. long; blades 



linear to ovate-lanceolate, 20-30 cm. long, with 



10-15 nerves each side the midrib. Panicle 



pyramidal, abont 20 cm. long, lower rays ternate 



and remote, more numerous above, the longest 



10 cm. long, bearing 10-15 spikelets from base 



to apex. Spikelets linear or ovate-lanceolate, 



8-9 mm. long; empty glumes 7- nerved, first 3 



mm. long, 3 mm. wide, second narrower and a Fiq. 103. Zeugites 



little longer ; floral glume of female floret tumid, \^^Wolia. A , spike- 

 ° '^ ' let ; a, noret. 



4-5 mm. long, 11-nerved; palea obovate, -4 mm. (Scribuer.) 



long, ciliolate on the keels; floral glume of male florets broadly 



ovate, subacute, 3.5 mm. long, 7-nerved, with a few cross-nerves 



near the apex; its palea oval, 3 mm. long. Anthers 2.2 mm. long. 



Mexico, Prinyle 204G, 2322. 



2. Z. Mexicana (Kunth) Triu. Steud. Nom. Ed. 2. 2 : 798 

 (1841). Despretzia Mexicana Kunth, Rev. Gram. 2:485 (1829). 



Culms slender, branching, 20-50 cm. high, from creeping root- 

 stocks. Sheaths shorter than the internodes, smooth; ligule 1.5-2 

 mm. long; petiole distinct, 4-10 mm. long, puberulent next the 

 blade; blades ovate, acute, -5 cm. long. Panicle thin, ovoid, 4- 

 6 cm. long, lower rays in twos, threes, or single, bearing each 1-d 

 spikelets. Spikelets glabrous, 3-flowered, 4-7 mm. long; empty 

 glumes equal, 3 mm. long, 5-nerved, truncate, 5-toothed; floral 

 glume oval, about 5 mm. long, many-nerved; palea longer and nar- 

 rower than its glume. 



Mexico (San Luis Potosi), Pringle 3919. Rich woods. 



118. (244). PleuroPOGON R. Br. Parry, First Voy. Suppl. 289. 

 (err. typ. IS'.i) (1824). /'. Lophochlcena Nees, Ann. Nat. Hist. (1) 

 1:283 (1838). 



Spikelets 8-14-flowered, secund, racemose, on a simple rachis^ 

 rachilla articulate above the empty glumes and between the florets. 

 Empty glumes membranous, subhyaline, 1 -nerved or the second with, 

 an obscure nerve on each side the central one, awnless, unequal; 

 floral glume longer, meml)ranous, ratlier firm, 5-7-nerved, apex 



