1908] Fernald,— Bidens connata and its American Allies 201 
Professor J. F. Collins and Dr. A. S. Pease, the writer came upon a 
colony of Bidens tripartita in damp hollows of an Arbor Vitae (Thuja) 
swamp. ‘The plant, which was quite new to him, suggested in some 
ways all three of its American allies, B. frondosa, B. vulgata and B. 
connata. Its simple leaves are on margined petioles and are variously 
cut, mostly into 3 or 5 coarsely toothed segments; thus differing from 
those of B. frondosa and B. vulgata which have the 3- or 5-foliolate 
leaves on marginless petioles, the terminal leaflet usually being dis- 
tinctly petiolulate. From B. connata, the foliage of which more nearly 
approaches that of B. tripartita, it is quickly distinguished by its 
flatish smooth 2-3-awned achene and the conspicuously ciliate 
foliaceous outer bracts of the involucre. 
When Bidens tripartita was found at Percé the writer, not knowing 
what it was, took it without question for an indigenous plant. It was 
growing with native species in a partly cleared swamp not far, how- 
ever, from the telegraph road which passes through the village. It 
has been seen nowhere else in the Gaspé Peninsula and it is possible 
that it may have been introduced from Europe, but its occurrence 
only in the swamp and not about the village or the wharves points 
to its probable indigenous character. In this connection it is note- 
worthy that the clearly indigenous flora of the Percé region — that of 
the mountain-crests, woods and primative swamps — contains many 
species common in northern Europe but rare or unknown in temperate 
America except about the Gulf of St. Lawrence. Among such plants 
may be mentioned Catabrosa aquatica (L.) Beauv., typical Glyceria 
fluitans (L.) R. Br., Poa alpina L., Scirpus rufus (Huds.) Schrad., 
Thalictrum alpinum L., Draba incana L. (true), Drosera anglica 
Huds., Pleurogyne rotata (L.) Griseb., Lappula deflexa (Wahlenb.) 
Garcke, Euphrasia arctica Lange, E. borealis Towns., and Rhinan- 
thus stenophyllus (Schur) Schinz & Thellung. It is probable, then, 
that Bidens tripartita, like the foregoing plants of northern Europe, is 
indigenous in the Gaspé Peninsula and that further search will show 
it to occur elsewhere than in the single swamp at Percé. 
BIDENS HYPERBOREA Greene. 
Another Bidens of the Gaspé Peninsula which in some of its char- 
acters suggests B. tripartita and B. comosa is a little plant which occurs 
in great abundance at the estuaries of rivers, where it is completely 
