14 



*Pamcuin multirameum Sciibn. V. S. Dept. A-rr. Div. Airros. Cir. 19: 2 f.Tannary, 



1900). 



A rather wlender, tufted perennial, 20 to 30 cm. high, with glabrous culms, densely 

 fasciculate-branched above, bearded nodes, and glabrous or thinly pilose sheaths 

 which are bearded at the throat. Lower culm leaves 5 to 8 cm. long, those on 

 the l)ranches much shorter and narrower, sparingly ciliate near the ))ase, pul)es- 

 cent beneath, minutely scabrous along the margins, which are very narrowly 

 cartilaginous. Panicles loosely flowered, 2 to 4 cm. long. Spikelets about 2 mm. 

 long, obtuse, and 7-nerved; the second and third glumes thinly pubescent; the 

 fourth glume subacute; the broadly obtuse first glume one-third to nearly one- 

 half as long as the spikelet. 



Gravelly hills near Jalapa, State of Vera Cruz, altitude 1,250 m., 7882 C. G. Pringle, 

 1899; Orizalja, State of Vera Cruz, 59.3 J. G. Smith, February 17, 1892. 



Allied to ranicum cUiosum Nash, but smaller, nodes more distinctly bearded, and 

 leaves less ciliate. 



Panicum obtusum H. B. K. Nov. Gen. et Sp. PI. 1 : 98 (1815). 



Torreon, State of Coahuila, 504 E. Palmer, October, 1898; Saltillo, 394 E. Palmer, 

 September, 1898; San Luis Potosi, 1631 E. Palmer, 1898; between Casas Grandes 

 and Sabinal, State of Chihuahua, 6352 E. W. Nelson, September 4-5, 1899. Low 

 places often overflowed. Extensively used as a purgative under the name of 

 "purga de paridas." 



*Panicum pilosum macranthum Scribn. U. S. Dept. Agr. Div. Agros. Cir. 19: 1 



(January, 1900). 

 Secondary axes or branches of the panicle (longer lower ones) 3.5 cm. long, pilose 

 with papillate hairs about 2 mm. long. Spikelets 2.2 mm. long, the outer 

 glumes strongly scabrous on the keel near the apex, as are the fruiting glume 



and palea. 

 Swamps near Jalapa, State of Vera Cruz, altitude 1,230 m., 8195 C. G. Pringle, May 



21, 1899. 



Panicum plantagineum Link, Hort. Berol. 1: 206 (1833). 



Near Colotlan, State of Jalisco, 3602 (in part) J. N. Rose, August 28, 1897. 



*Panicum polycaulon Nash, Bui. Torr. Bot. Club, 24: 200 (1897). 



Low places, borders of swamps, Minatitlan, State of Vera Cruz, 555 Jared G. Smith, 

 June 30, 1892. 



Panicum repens L. Sp. PI. ed. 2, 87 (1762-63). (P. littorale Vasey, Bot. Gaz. 3: 106 

 (1878); P. gouhn Foiu-n. Mex.Pl.2: 28 (1881).) 



Coatzacoalcos, Isthmus of Tehuantepec, State of Vera Cruz, 913 C. L. Smith, March 

 8, 1895. 



Panicum reticulatum Torr. in Marcy's Explor. Red Riv. La. 299 (1852). 



Between Rosario and Acaponeta, 1884 J. N. Rose, July 28, 1897. 



Panicum sanguinale L. Sp. PI. 57 (1753). 



Colima, 148 E. Palmer, 1897, in a deep, shady ravine; Durango, State of Dnrango, 

 766 E. Palmer, October, 1896. Common in fence rows, etc. 



Panicum sanguinale ciliare (Retz. ) Vasey, U.S. Dept. Agr. Div. Bot. Bui. 8: 23 

 (1889). {I\tnicuw clluire Retz. Ohi'. 4^: 16(1779-1791).) 



Rosario, State of Sinaloa, 1541 J. N. Rose, July 7, 1897. 



PANICUM (DIMORPHOSTACHYS) UNISPICATUM Scribn. & Merrill, sp. 

 nov. 



A slender, erect perennial, 8 to 15 dm. high, with glabrous culms, sparingly pilose 

 sheaths, lanceolate or linear-lanceolate leaves, and long-exserted solitary spikes 

 9 to 12 cm. long. Culms very smooth throughout; nodes smooth; sheaths 

 eiiualing or shorter than the internodes, loose, striate, ciliate on the margins, 

 smooth below, sparingly tuberculate-pilose above; ligule hyaline, membranace- 

 ous, lacerate, about 2 mm. long; the throat rather densely bearded, immediately 



