1922] Weatherby,—New Species of Eleocharis 25 
E. arenicola Torr., of which E. fallax may be regarded as a north- 
eastern representative, is a species of wide range, extending from 
South Carolina along the coast to Florida and Texas, thence westward 
across the continent, apparently following the tertiary and quarter- 
nary formations, to southern California and southward, through many 
Mexican stations, to Guatemala. It varies considerably in certain 
characters. In all the specimens seen from the southeastern states, 
the achene is fuscous and the whole. base of the tubercle is adnate to it. 
In typical E. arenicola from Texas the achene is yellow and the point 
of attachment less wide than the base of the tubercle so that its lateral 
portions are free. Both types of achene and intergradient forms 
occur, however, in Californian and Mexican material and, as there 
are no correlating characters, segregation on these lines seems imprac- 
ticable. 
Since most of the Mexican specimens of E. arenicola were distribu- 
ted as E. montana, E. truncata, or without a name, it may be worth 
while to cite representative specimens. Such are: Saltillo, Coahuila, 
June, 1898, Palmer, no. 255; in paludosis, Morales, San Luis Potosi, 
1876, Schaffner, no. 577, and Penasco, no. 578; Durango, 1896, Palmer, 
nos. 99, 974; Valley of Oaxaca, April 19, 1896, Conzatti, no. 94. 
E. arenicola is apparently closely allied to E. montana (HBK.) R. & 
S., with which it has been united. There is in the Gray Herbarium 
a single specimen (Lehmann, no. 8735) which is from the type region 
of E. montana and which, as Dr. Britton has noted on the sheet, may 
represent that species. Except in the shape of the spikelet, it agrees 
well with the original description, especially in the two points, the 
many-flowered spikelet and the more or less acute scales, in which 
it differs most conspicuously from E. arenicola. It seems likely that 
E. arenicola and E. montana are closely related, but sufficiently 
distinct species. 
Two other species, E. Dombeyana Kunth and E. truncata Schlecht., 
have also been referred to E. montana, but, from the specimens on 
hand, appear very distinct. The former is a plant of the South Ameri- 
can Andes, ranging, so far as the material seen indicates, from Ecuador 
to Bolivia. There is no absolutely authentic specimen in the Gray 
Herbarium, but the following seem certainly to belong here: Ecua- 
por: in Andibus, 1857-9, Spruce, no. 5912; in hot springs at Banos, 
