— 
228 UNITED STATES AND MEXICAN BOUNDARY 
ELEOCHARIS EQUISETOIDES, Torr. Сур. р. 296. E. Elliotti, Dietr. Spec. 2, p. 82, ex Kunth. 
Scirpus equisetoides, EU. Sk. 1, p. 79. Іп water, borders of the San Felipe. Near the Rio 
Grande, October ; Bigelow. The nodes of the culm, especially on the upper part, are much 
more closely approximated than usual. 
ELEOCHARIS CELLULOSA, Torr. Сур. p. 298. Boggy banks of the Royo Zaquete, September ; 
Schott. Rio Colezo, Texas; Thurber. Rutenville in the same State ; Wright. We have speci- 
mens also from Key West, collected by Mr. Blodgett. 
ELEOcHARIS PALUSTRIS, R. Brown, Prodr. p. 224: Torr. Сур. p. 299. Alluvial soils, in over- 
flowed places, from the Rio Grande to California. A variety with spikes nearly an inch long, 
and with only rudimentary bristles at the base of the nutlets, was found by Dr. Bigelow near 
San Elceario, on the Rio Grande. (Nos. 710, 712, 1934, 1957, and 1960, Wright.) 
ELEOCHARIS OBTUSA, Schultes, Mant. 2, p. 89; Torr. Сур. p. 303. Western Texas ; Wright. 
ELEOCHARIS CAPITATA, ЇР. Brown, Prodr. р. 225; Torr. Сур. p. 305. On the Rio Coleto, Texas; 
Thurber. (Nos. 1932 and 1933, Wright:) 
ELEOCHARIS ROSTELLATA, Torr. Fl: N. York, 2, p. 347. Scirpus rostellatus, Torr. Сур. p. 318. 
Pedro, Pinta, etc. Santa Rita del Cobra, New Mexico ; Bigelow. San Bernardino, Sonora; 
Thurber. (Nos. 1931, 1934, and 1956, Wright.) j 
ELEOCHARIS TENUIS, Schultes, var. B. Torr. Сур. p. 310. Western Texas; Wright, (No. 713.) 
In old spikes the scales are deeply bifid, and the divisions acute. The nutlets are pyriform, of 
a brownish yellow color, very obscurely triangular, with three slightly elevated lines at the 
angles. The bristles are only rudimentary. 
ELEOCHARIS ARENICOLA, Torr. in Engelm. & Gray, Pl. Lindh. р. 30. Western Texas; Wright, 
(No. 1958 and 1959.) The plant 18 much taller (12-15 inches) than the original specimens, 
and the bristles are barely as long as the nutlets ; bnt in other respects there is no difference. 
ELEOCHARIS ACICULARIS, R. Brown, Prodr. 1, p. 224; Torr. Сур. p. 308. Western Texas to 
“ California. Wright's No. 1937 is a small form, growing on wet ground. 
Scirpus OLNEYI, Gray, in Engelm. & Gray, Pl. Lindh. р. 30, (adn.) & Man. ed. 2, p. 499. 
Copper Mines, New Mexico, Bigelow. San Bernardino, Sonora; Thurber. (No. 1964, Wright.) 
The style is sometimes 3, and even 4-cleft. 
SCIRPUS PUNGENS, Vahl, Enum. 2, p. 255 ; Gray, Man. l. c. Frontera, Texas; Parry. (Хо. 
1941 and 1963, Wright.) The spikes are oblong or sometimes almost cylindrical, and the style 
is more frequently 3- than 2-cleft. 
SCIRPUS LACUSTRIS, Linn; Torr. Сур. p. 321. 5. validus, Vahl, Enum. 2, p. 268. S. acutus, 
Muhl. Gram. p. 33. On the Rio Grande and its tributaries, from El Paso to San José, and 
westward to California. On the valley of the Sacramento, Dr. Hulse, there are thousands of 
acres covered with this plant, and of the height of 9 or 10 feet. It is called Тиё or Giant rush. 
It varies much in the size of the panicle. The perigynous bristles are mostly narrow and 
retrorsely hispid, but sometimes broad and retrorsely or horizontally plumose. These characters 
are not constant, there being intermediate forms. Bentham refers No. 2021 of Hartweg's Cali- 
fornian collection to S. riparius, Presl, which Kunth regards as identical with Elytrospermum 
Californicum, C. A. Mey. ; which again is the same as the earlier Malacochete of Nees. Іп our 
specimen of Hartweg's plant there are four plumose bristles, while Meyer states that there are 
but two in his Elytrospermum. The number of these organs is, however, by no means constant 
in this genus, and in every other respect Elytrospermum resembles the form of Sc. lacustris with | 
