26 Rhodora i [FEBRUARY 
vicinity of Cuenca, Sept. 17-24, 1908, Rose, no. 22893. Bo.tv1a: vicin- 
ity of La Paz, alt. 10,000 ft., 1890, Bang, no.144; vicinity of Cochabam- 
ba, 1891, Bang, no. 996. 
E. truncata is apparently a very local plant of the Federal District 
of Mexico. lt is very close to E. Dombeyana, from which it is distin- 
guished by its longer and proportionately narrower spikelets and by 
the slightly different shape of the achenes. Here belong the following: 
Mexico, FEDERAL District: wet soil, Cuantitlan, Aug. 14, 1899, 
Pringle, no. 8214; Valley of Mexico, May 7, 1898, Pringle, no. 7655; 
bords des fossés, prés Mexico, May 3, 1866, Bourgeau, no. 214. 
The appended key may help to distinguish the plants discussed. 
a. Achenes 1-1.5 mm. long; upper sheaths commonly mucron- 
ate. À 
b. Tubercle mucroniform, its sides nearly parallel, much less 
than half as wide as the body of the nearly smooth 
achene. 
c. Spikelets ovate, the largest not over 8 mm.long......... E. Dombeyana. 
c. Spikelets lanceolate to linear, rarely under 8 and up to 
oro 7o en enn m E. truncata. 
b. Tubercle pyramidal, much wider at base than above, 
about half as wide as thebody of the achene, which is 
distinctly though lightly reticulate-roughened under 
magnification. 
d. Well-developed spikelets 70-85-flowered ; scales oblong- 
ovate, at least the upper acute.................... E. montana. 
d. Well-developed spikelets not over 45-flowered; scales 
ER. X50. 9] gd as os ah ee T TM E, arenicola. 
a. Achenes 1.7-2 mm. long, lightly but distinctly reticulate- 
roughened under magnification; tubercle pyramidal; 
e TT TT Tee E. fallax. 
Gray HERBARIUM 
NOTES ON SPARGANIUM. 
M. L. FERNALD. 
SINCE the publication! in 1907 of the detailed notes on Sparganium 
much material has accumulated and new light has been thrown on 
the identities and ranges of our species. 
Prior to the war the most scholarly authority on the genus, Pro- 
fessor Wladislaw Rothert, formerly of the University of Odessa, later 
residing at Riga or at Cracow, had in preparation a monograph of 
the genus and some of the matter here presented was to have been 
published by him. Since, however, Dr. Rothert suffered the tragic 
1 Fernald & Eames, Ruopora, ix. 86 (1907). 
