* 
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. laxum. 
4. Stems woody, bamboo-like. 13. P. latifolium. 
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. Sintenisit. 
Second scale of the spikelet 5~7-nerved, the fourth scale transversely rugose. 
15. P. flavescens. 
I. PANICUM BREVIFOLIUM L, Sp. Pl. 59. 1753. 
In fields and waste places, frequent. Santurce, Heller 157 ; 
Martin Pefia, Heller 387; Luquillo Mts., Wilson 283; Adjuntas 
road, near Ponce, Heller 6094. 
2. PANICUM TRICHANTHUM 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 1 mm. wide, pubescent with 
spreading hairs. 
Type collected in rich soil at Santurce, January 9, 1899, by 
Heller, no. 12. 
Related to P. ciliosum 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 
