176 The Botanical Gazette. [June, 
troides, Isopyrum biternatum, Claytonia Virginica, Erigenia 
bulbosa and Erythronium albidum, all of which have the ad- 
vantage 
doubt, however, that the plant originally depended for fertili- 
zation mainly upon the aid of bees of the genera Halictus and 
Andrena and flies of the family Syrphidae. 
I have found the flowers in bloom from April 2 to 13. On 
April 13 I noted the following visitors: 
Hymenoptera—Apzdae: (1) Apis mellifica L. %, c. p., ab. 
Sees is aa (2) Halictus zephyrus Sm. 9, c. p.; (3) H. stultus 
i 9 
ep 
Diptera— Syrphidae: (4) Syrphus sp., f. p. 
: Coleoptera —Cedemeridae: (§) Asclera ruficollis Say, f. Ps 
Teq. 
I also saw several individuals of Andrena bicolor F. 4 flying 
about the flowers in search of the female, which is probably a 
visitor. 
At Madison, Wisconsin, May 9, Professor Trelease found 
the flower visited for pollen by Axdrena bicolor F. % and 
Halictus confusus Sm. 
The stems rise about a foot from the ground, are diffusely 
branched and bear large, drooping racemes of handsome, 
cream-colored flowers. 
The calyx tube measures about 5 or 6 mm. and serves t0 
hold the petals so that they can not easily be separated geet 
truders. The banner runs forward for about 14 mm. whet} 
tises nearly straight upwards. Its blade measures 20 we 
more in breadth, and is not so strongly reflexed at the s! 
asin B. leucantha. The wings extend forward and concea 
the keel. At the base above, the blade is inflected upo? - 
gibbosity upon the base of the keel, with the result ere 
= a bee lands upon the flower, it depresses both wings @ 
eel. 
_, The stamens are distinct. Since there is is no special ae 
ing at the base to admit the bee’s tongue, as in the dia 
