164 PANICACE^. 



Spikes exserted, interrupted below, 7-15 cm. long, 8 mm. diam., 

 bristles all simple (not plumose), all shorter than the single spike- 

 let or one of them longer. Spikelet elliptical, acute, about 7 mm. 

 long, first and second glumes ovate, 1 -nerved, the former about 2 

 mm. long, the latter 3 mm', long; floral glume of the neuter floret 

 acute, 4-6 mm. long, 4-5-nerved, its palea about 1 mm. long; 

 fertile floret acute, 5-6 mm. long, the glume 5-nerved. Grain 

 obovate. 2 mm. long. 



Mexico. Pringle 489, 817. The name given by Scribner had 

 been used by Spreug and is a synonym for Setaria purpurea. 



Found under cliffs of ledges. 



2. P. multiflorum Fourn. Hemsl. Biol. Centr. Am. Bot. 3 : 508 

 (1880). 



Culms erect, solid, 30-40 cm. high. Sheaths smooth or sca- 

 brous ; ligule a fringe of hairs ; blades flat, scabrous or hispid, 30-40 

 cm. long, 5-8 mm. wide. Spikes exserted, 9-15 mm. long, 10-12 

 mm. diam. Involucre consisting of about 20 pectinate bracts, all a 

 little shorter, or some of them as long or some longer than the 5 

 spikelets, except one that is larger; many smaller bristles below. 

 Spikelets ovoid-lanceolate, about 6 mm. long, first glume ovate, 1- 

 nerved, 3 mm. long, second ovate acute, 5-rierved, 5-6 mm. long; 

 floral glume of neuter floret 5-nerved, 5.5 mm. long, that of the 

 terminal floret a little longer. 



Mexico (Jalisco), Pringle 3848. 



Wet slopes of Barranca near Guadalajara. 



3. P. LATiFOLiUM Spreng. Syst. 1 : 302 (1824). Gymnothrix 

 latifolin Schult. Mant. 3: 601 (1824). 



Culms stout and tall, branching above, 120-150 cm. high, the 

 nodes clothed with short hairs. Leaf -blades flat, 30-60 cm. long, 

 2-3 cm. wide, narrowed into a petiole, midrib prominent, white. 

 Spikes 4-6 cm. long, protruding from the upper sheaths, invo- 

 hicre consisting of about 20 simple bristles as long as the spikelets, 

 and one bristle much longer (15 mm. long). Spikelets linear- 

 lanceolate, not far from 6 mm. long, first glume 1 mm. long, second 

 ovate-acute, 3-nerved, 2-3 mm. long; floral glume of the neuter 



