380 Nash : Enumeration of the 



Spikelets about 3 mm. long : stems stout : leaf-blades long and 

 linear. 11. P. molle. 



Fourth scale of the spikelet smooth. 12. P. laxitm. 



b. Stems woody, bamboo-like. 13. P. latifoliiini. 



2. Apex of the panicle-branches extending beyond the insertion of the spikelets in an 

 awn-like appendage. 

 Second scale of the spikelet 3-nerved, the fourth scale smooth. 



14. P. Sintenisii. 

 Second scale of the spikelet 5-7-nerved, the fourth scale transversely rugose. 



15- P. JJavescens. 



1. Panicum brevifolium L. Sp. PI. 59. 1753. 



In fields and waste places, frequent. Santurce, Heller 157; 

 Martin Pena, Heller 387; Luquillo Mts., Wilson 283; Adjuntas 

 road, near Ponce, Heller 6094. 



2. Panicum trich antrum Nees, Agrost. Bras. 210. 1829. 



In moist ground, between Aibonito and Cayey, Heller 531. 



3. Panicum comophyllum sp. nov. 



A tufted densely pubescent perennial, finally much-branched, 

 with broad flat leaf-blades and rather large panicles. Stems 3-4 

 dm. tall, hirsute with long ascending hairs : leaves 5—7 ; sheaths 

 densely hirsute with spreading hairs, the primary ones shorter 

 than the internodes and the blades ; ligule a ring of stiff hairs 

 about 2 mm. long ; blades spreading or ascending, flat, softly 

 hirsute on both surfaces with spreading hairs, those on the 

 upper surface the longer, ciliate on the margin with stiffer hairs ; 

 those on the main stem oblong-linear to ovate-lanceolate, acute, 

 barely cordate at the somewhat clasping base, 5—7 cm, long, 10- 

 13 mm. wide: panicle somewhat exserted, 5—7 cm. long and 

 about as broad, broadly ovate, the main axis pubescent with short 

 spreading hairs, its branches somewhat ascending : spikelets broadly 

 obovate, 1.5 mm. long and about i mm. wide, pubescent with 

 spreading hairs. 



Type collected in rich soil at Santurce, January 9, 1899, by 

 Heller, no. 12. 



Related to P. ciliosinn Nash, of the southern United States, 

 but readily distinguished by its softly pubescent leaf-blades. 



4. Panicum Nashianum Scribn. Bull. U. S. Dept. Agric. Div. 

 Agrost. 7 : 79. 1897. 



In sand, quite common. Vega Baja, Heller, 639 ; Manati to 



