32 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Texas: Dallas, Reverchon 1078; Giddings, Hall 823; Houston, Thurow in 1898; 
Pierce, Tracy 7392; Spofford, Griffiths 6306; without locality Nealley in 1884. 
Mexico: Lower California, El Taste, Brandegee in 1893; San José del Cabo, Bran- 
degee 14, 36; Guaymas, Palmer 690 in 1887; Yaqui River, Palmer 15 in 1869; 
Acapulco, Palmer 289 in 1894; 
Yucatan, I[zamal, Gawmer 1027 
(Hitchcock Herb.). 
GUATEMALA: San José, Kellerman 
6250. 
BanHaMas: Nassau, Curtiss 175. 
Cusa: Santiago de las Vegas, 
Mitchcock 143; Habana, Ledén 
918; Batabano, Hitchcock 142; 
Hanabana, Wright 761; Guana- 
bacoa, Leon 920; Guantanamo, 
Britton 2281. 
Jamaica: Gordon Town, Hart 806. 
Porto Rico: Guanica, Sintenis 3367. 
DanisH West Inp1Es: St. Croix, Ricksecker 212; St. Thomas, Eggers in 1882. 
LEEWARD IsLANps: Guadeloupe, Duss 2690, 3584, L’ Herminier. 
WinpDwWaRrD Istanps: Martinique, Duss 1293. 
CoLomMBIA: Santa Marta, Smith 151. 
British GUIANA: Jenman 3969, 4438, 6022. 
Dutcu Guiana: “Surinam” Hering (Acad. Phil. Herb.). 
Brazit: Bahia, Salzmann. 
Peru: Lima, Wilkes Expl. Exped. 
GaLAPAGos IsLanps: Snodgrass & Heller 557, 746 (Gray Herb.). 
Fic. 12.—Distribution of P. geminatum. 
8. Panicum paludivagum sp. nov. 
DESCRIPTION. 
Plants apparently perennial, glabrous throughout; culms elongated, from a long, 
creeping base, rooting at the nodes, rather soft and succulent, as much as 2 meters long, 
the lower submerged portion loosely branching, 
the internodes, except the uppermost, some- 
what swollen, the nodes constricted and often 
dark colored; sheaths papery and more or less 
inflated, especially the lower, mostly deciduous 
from the submerged portion; ligule ciliate, 
about | mm. long; blades 15 to 40 cm. long, 
conduplicate at base, flat above, long-acumi- 
nate, rather lax, very scabrous on the upper 
surface, smooth below, the lower much reduced 
or rudimentary; panicle usually overtopped or 
Fig. 13.—P. paludivagum. Fromtype  ©4ualed by the leaves, 25 to 35 cm. long; axis 
specimen. angled, smooth; racemes 12 to 15, erect, the 
lower distant, 3 cm. long, the upper gradually 
approximate and shorter, the axis ending in a rudimentary spikelet or sometimes 
in a short, slender-pointed prolongation; spikelets appressed to the angled rachis, 2.8 
to 3 mm. long, 1.4 to 1.6 mm, wide, narrowly ovate, not turgid, subacute; first glume 
about one-fifth the length of the spikelet, nerveless, erose-truncate; second glume half 
to two-thirds the length of the spikelet, faintly 3-nerved; sterile lemma as long as the 
fruit, very faintly nerved toward the summit, inclosing a palea of equal length and a 
staminate flower; fruit 2.8 to 3mm. long, 1.2 to 1.3 mm. wide, narrowly ovate, acute, 
very obscurely rugose, the margins scarcely inrolled. 
