1924] Fassett,—A new Variety of Bidens heterodoxa 177 
plant in Plymouth County. In this same bog Dr. Cheever has also 
found Habenaria lacera and Calopogon pulchellus. Habenaria flava 
is another rare orchid we have seen in town. 
In one of the swamps is Carex riparia, frequent in western Vermont, 
but not so well known in eastern Massachusetts. It has blue-green 
leaves, and looks quite distinct from the abundant C. stricta and the 
other sedges in the swamp. On one of the eskers, and in another 
place in light pine woods, there are good colonies of C. laxiculmis. 
There are twenty-three kinds of ferns known in town. Thelypteris 
simulata, Woodwardia virginica and W. areolata are frequent, this 
association of the three species being characteristic of low woods near 
the coast as far north as New Hampshire. Thelypteris Boottii was for 
some reason overlooked by the authors of the list in tneir survey of 
the town. Dr. Cheever has found one good colony of Adiantum 
pedatum, not on the list. Lycopodium inundatum is abundant at one 
station. L. annotinum is on the Bouvé list, and after a careful search 
was found in two stations a quarter of a mile apart, in deep woods. 
All in all we have had a very good time checking up this old list, 
and we hope to continue our explorations till we have as complete 
a knowledge of the town flora as did Mr. Bouvé and his associates. 
HINGHAM, MASSACHUSETTS. 
A NEW VARIETY OF BIDENS HETERODOXA. 
NorMAN C. FASSETT. 
Tuz fresh-water tidal flats at the mouth of the Kennebec River, 
in central Maine, extend from a mile above Bath to Augusta, a distance 
of nearly thirty miles. The lower part of this estuary, and the mouths 
of the rivers entering it, have been rather extensively explored. 
Professor Fernald and Mr. Bayard Long have collected along the 
tidal shores of the Cathance River at Bowdoinham, and the writer 
has botanized most of the western shore of Merrymeeting Bay. 
Large collections of Bidens made in these regions have consisted of 
three entities: B. hyperborea Greene, varieties colpophila (Fernald 
& St. John) Fernald and cathancensis Fernald, and B. Eatoni Fernald, 
var. kennebecensis Fernald, the last two being endemic to this estuary 
system. 
