Rhodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 10. November, 1908. No. 119. 
BIDENS CONNATA AND SOME OF ITS AMERICAN 
ALLIES. 
M. L. FERNALD. 
BIDENS CONNATA Muhl. 
In September last Mr. C. A. Weatherby and the writer made two 
visits to the shores of Winter Pond in Winchester, Massachusetts, 
a station which for generations has furnished New England botanists 
with local or otherwise remarkable plants. One of the conspicuous 
plants at that season was a Bidens which grew in abundance between 
the thicket and the sandy beach as well as in the adjacent swampy 
areas. The primary leaves of the plant were so unusual in their 
appearance, especially in having toward the base two lobes which were 
strongly decurrent to the winged petiole, that we gathered material 
for further study. Later comparison in the herbarium showed it to 
be a little known plant, represented in the Gray Herbarium only by 
a specimen collected as unusual by the late Alvah A. Eaton and the 
writer at Salisbury, Massachusetts, in 1902, and another collected by 
Professor John Macoun at Ste. Anne de Beaupré, Quebec, in 1905; 
while the herbarium of the New England Botanical.Club has two 
sheets,— one collected by Mr. W. P. Rich at Spot Pond, Stoneham, 
Massachusetts, in 1894, the other by Mrs. Clara Imogene Cheney at 
Centerville, Massachusetts, in 1900. More recently Professor К. M. 
Wiegand and the writer have revisited the Winter Pond station; and 
we have found the plant with the lateral lobes of the leaves conspicu- 
ously decurrent along the petiole about Lake Waban at Wellesley, 
Massachusetts. ‘The writer has also seen it in the Fresh Pond marshes 
in Cambridge. It is probable, then, that this peculiar plant is much 
