1920] St. John, — Elodea in New England 25 
but with more narrowly oblong, often somewhat acutish leaves. 
* * * The spathe is like that of P. angustifolia, but larger, 5-6 
mm. long, the anthers in the unopened flower 2-2.5 mm. long.” 
He had one sheet from New Jersey with staminate and pistillate 
flowers and other pistillate and sterile plants from New York and 
Virginia. The writer has seen one sheet, with sessile staminate 
spathes 5 mm. long, the anthers 2 mm. long, immature pistillate 
flowers, the leaves narrowly oblong, acutish, much stiffer than those 
of occidentalis and not crowded at the summit of the stem as those of 
canadensis. This tallies exactly with Nuttallii, and there are several 
sheets from a broad range that on their vegetative characters would 
be put into Nuttallii. There are, however, two sheets from southern 
New England which throw a shadow of doubt on the specific value 
of the characters of Nuttallii. They are S. N. F. Sanford, no. 454, 
in slow stream, Fall River, Massachusetts, August 14, 1913; and 
C. A. Weatherby, no. 3,596, coll. E. B. Harger & C. A. Weatherby, 
shallow water of Housatonic River, Huntington, Connecticut, Sep- 
tember 17, 1914. They combine the vegetative characters of Nut- 
tallii and the floral characters of occidentalis. These will be consid- 
ered as intermediate specimens and consequently Nuttallii as a 
doubtful species needing further study. 
The only other species occurring in New England is Elodea Planch- 
onii Caspary. As a matter of fact these four species, all occurring 
in New England, are, after a study of the specimens in the Gray 
Herbarium, the Herbarium of the New England Botanical Club, 
the Herbarium of Brown University, and the private herbaria of 
Mr. Walter Deane and Mr. C. A. Weatherby, all the species 
that the writer has been able to recognize in the United States and 
Canada. He has seen no material to represent Philotria linearis 
Rydb.  Amacharis canadensis Planchon: based on material from Can- 
ada: Saskatchewan, Drummond; and Canada: Cleghorn was reclassi- 
fied as Elodea Planchonii Caspary. There is a good duplicate of 
the Drummond specimen in the Gray Herbarium. The flowers are 
dioecious, like those of occidentalis and Nuttallii, but the staminate 
flowers are remarkably distinct. When young they are sheathed 
in a spathe which is narrowed to a pedicel-like base. The swollen 
terminal portion has its upper end open like a wide gaping mouth. 
1 Ann. Sci. Nat. Bot. 3rd ser. xi. 75 (1849). 
? Pringsheim's Jahrb. wissen. Bot. i. 468 (1858). 
