90 PAMCAl'K/E. 



exeet'diiig thuir own length, oval, obtuse or subsicute, 2.5-2.7 mm. 

 long; first and second glumes equal, 3-norved, but little longer 

 than the lloret. 



Mexico (San Luis Potosi), Prinffle 3755, and farther south. 

 Alkaline meadows. 



J 4. P. Drummondii C. Muell. Jiot. Zeit. 19:332 (18G1). /'. 

 IvutiyiHosKin of Vasey's Catalogue, not Preal. 



Culms erect, slender, smooth, often branching below, 60-90 cm. 

 higli. Siieaths loose; blades 1-3 cm. long, 10-13 mm. wide, one 

 margin undulate. Spikes 3-5, 2-4 cm. apart, the lowest ones 7-10 

 cm. long, the upper a little shorter, rachis subflexuose, less than 1 

 mm. wide. Spikelets in pairs, oboi^ate-oval, minutely jjubescent and 

 brown-spotted, a little over 2 mm. long. Usually with a minute 

 sterile glume on the flat side as in Panicum. 



Texais, Kealley in 18S8. 



15, P. macrophyllum H.B.K. Nov. Gen. et Sp. 1:92 (1815). 

 P. phi It i folium Fourn.? Hemsl. Biol. Centr. Am. Bot. 3:48 (1880). 



Culms 90-1-^0 cm. high, smooth. Sheaths hispid, ciliate at 

 the throiit; ligule very short; blades flat, scabrid or smooth, 

 18-25 cm. long, 1-2 cm. wide, acuminate, pungent-pointed. 

 Spikes 5-8, sessile, scattered, somewhat distant, the lower 6-12 cm. 

 long, the others gradually shorter, rachis flat, 1 mm. wide. Spike- 

 lets ])ur])le. more or less in four irregular rows, crowded, ellijitical, 

 obtuse. 2-2.:'. nun. long, first and second glumes equal, 3-nerved. 



Mexi^'o (Siin Luis Potosi), Priixjle 3779. 



Low fields. 



Tlie ])lants were identified by Professor Scribner; who, on 

 account of meagre deseriittions, is uncertain as to the correct 

 name. The type specimens were not at liand for comparison. 



16. P. plicatulum Mielix. Fl. Bo:. Am. 1:43 (1803). P. uu- 

 dttlafiim Poir. Lam. Pmcycl. 5:29 (1804). 



(hdms 30-()0 cm. high, simple, smooth. Leaf-blades smooth, 

 15-20 cm. \m\^, 5-8 mm. wide. I'anicle 10-13 cm. long. Spikes 

 5-7, recurved, 2-6 cm. long, the upi)er much the shorter, rachis 

 less than 1 mm. wide, flexuose. Spikelets in pairs, one pair about 

 3 mm. above or below another f)air, oval, obtuse, convex on the 



