12 Rhodora [JANUARY 
characters being quite unlike either of the other eastern American 
plants. The only known station in the Atlantic states for E. triandra 
is at Skowhegan, Maine, where it was collected in October, 1914, by 
Miss Louise H. Coburn from the bottom of a small pond in the park, 
In response to a letter from the writer Miss Coburn collected addi- 
tional material on October 28, 1916, and wrote in regard to the station: 
“The pond is a natural bog-hole, enlarged and shaped for the Park 
and has been planted with water-lilies, which came from the Mount 
Desert Nurseries, Bar Harbor, and a few from Farquhar & Co. of 
Boston and Dedham.” 
Whether or not Elatine triandra is indigenous in Maine waits to be 
determined. The species is certainly indigenous in Yellowstone Lake 
and at other very remote points in the Rocky Mountain region, 
although there is grave doubt as to the identity of the plant reported 
under this name from Illinois. The species is common in Europe and 
it is not impossible that it was introduced with roots of nursery stock 
into the pond at Skowhegan. The question whether it is indigenous 
in New England can be determined only by finding it at other stations 
which have not been altered or planted to foreign plants. 
By way of summary and in order to check the herbarium specimens 
seen, the following synopsis is appended. The specimens examined 
are in the Gray Herbarium and the herbaria of the New England 
Botanical Club and of the Academy of Sciences at Philadelphia. 
A. Seeds slender-cylindric, usually curved, 140-190» thick, with 20-30 
acute cross-ribs between the irregular or obscure longitudinal ribs: 
flowers 3-merous. B. 
B. Leaves obovate to broadly spatulate, with rounded summits. 
ELATINE AMERICANA (Pursh) Arnott, Edinb. Journ. Nat. & Geogr. 
Sci. i. 431 (1830). Peplis americana Pursh, Fl. Am. Sept. i. 238 
(1814).— Forming prostrate mats becoming, when fully developed, 
0.6-2 dm. broad; the subascending branchlets 1-5 cm. long: leaves 
3-8 mm. long, 1-4.3 mm. broad (in dried specimens): sepals 3: petals 
3: stamens (?) 3 or 6.— Chiefly, if not always, in wet clay, locally 
from Quebec to Delaware’ and eastern Pennsylvania. QUEBEC: 
on mud, Hull, October, 1890, J. Macoun: near Hull, October 4, 1904, 
J. Macoun, Herb. Geol. Surv. Can. no. 76,922. Marne: tidal mud- 
flats of Cathance River (best developed on open mud of small tribu- 
tary brooks and rills), September 14 and 19, 1916, Fernald & Long, 
no. 14,107. Connecticut: muddy border of Cartwheel Pond, 
Southington, August 22, 1900, C. H. Bissell; muddy shore of pond, 
Maltby Park, Orange, October 10, 1873, F. W. Hall (plants with 
