32 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Fig. 12.— Distribution of P. geminatum. 



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 Jose del Cabo, Bran- 



degee 14, 36; Guaymas, Palmer 690 in 1887; Yaqui River, Palmer 15 in 1869; 



Acapulco, Palmer 289 in 1894; 



Yucatan, Izamal, Gaumer 1027 



(Hitchcock Herb.). 

 Guatemala: San Jose, Kellerman 



6250. 

 Bahamas: Nassau, Curtiss 175. 

 Cuba: Santiago de las Vegas, 



Hitchcock 143; Habana, Leon 



918; Batabano, Hitchcock 142; 



Hanabana, Wright 761 ; Guana- 



bacoa, iedn 920; Guantanamo, 



Britton 2281. 

 Jamaica: Gordon Town, Hart 806. 

 Porto Rico: Guanica, Sintenis 3367. 



Danish West Indies: St. Croix, Ricksecker 212; St. Thomas, Eggers in 1882. 

 Leeward Islands: Guadeloupe, Duss 2690, 3584, UHerminier. 

 Windward Islands: Martinique, Duss 1293. 

 Colombia: Santa Marta, Smith 151. 

 British Guiana: Jenman 3969, 4438, 6022. 

 Dutch Guiana: "Surinam" Hering (Acad. Phil. Herb.). 

 Brazil: Bahia, Salzmann. 

 Peru: Lima, Wilkes Expl. Exped. 

 Galapagos Islands: Snodgrass & Heller 557, 746 (Gray Herb.). 



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 1 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 

 equaled by the leaves, 25 to 35 cm. long; axis 

 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 3 mm. long, 1.2 to 1.3 mm. wide, narrowly ovate, acute, 

 very obscurely rugose, the margins scarcely inrolled. 



Fig. 13. 



-P. paludivagum. From type 

 specimen. 



