154 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 1. NO. 3. 
resembles L. nigra, L., a honeysuckle growing in the Alps, an 
account of which has been furnished by Hermann Mueller (12). 
Lonicera SuIIivantii, Groy* Sullivant^s Honeysuckle* 
It is the commonest species in this part of the country and 
the latest to appear, blooming from June 5 to July 2. Robert- 
son (13) has published an account of its fertilization and reported 
the visits of 3 bees, i Syrphid-fly and the hummingbird. This 
is a bumble-bee flower, like L. dioica, resembling the latter in 
many respects and blooming directly after it. In this species too 
the flowers are in whorls at the ends of the branches and are 
mostly in a horizontal position. They are whitish-yellow, but 
later on change to purplish. The formation of a lower and an 
upper lip is much the same as in L. dioica. Flowers from our 
neighborhood present the following dimensions: The corolla 
tube has a length of 14 mm., a width of 4 mm. at its mouth and 
of 2 mm. in its narrowest portion, immediately above the nectar- 
secreting gibossity. Nectar is also secreted in small drops along 
the lower wall of the tube as far as the middle of the latter, and 
this accounts for the rather frequent visits of short-tongued bees, 
which are able to crawl into the mouth of the tube and reach 
these drops of honey. At the bottom of the tube honey accumu- 
, lates to a height of 2 or 3 mm. and this can of course be obtained 
by long-tongued visitors only, such as bumble-bees, hawk-moths 
and hummingbirds. The stigma is 10 mm. from the mouth of the 
tube and about i mm. in advance of the anthers. As in L. dioica 
the flowers are homogamous or sliglitly proterogynous. I have 
repeatedly seen the style, bearing the receptive stigma protrude 
for a length of 3 to 5 mm. from the bud previous to its opening 
These cases furnish an excellent opportunity for cross-fertilization, 
which is brought about by bees crawling over the inflorescence, 
with pollen attached to the underside of their bodies. On sunny 
days the flowers may be observed opening at all times of the day. 
The following is a list of the visitors as taken during the last 
two seasons: 
A* Bees* 
Apidae: (i) Apis melliiica, L. ^ , s.; (2) Bomhiis ameri- 
canorum, F. 9 , s. ; (3) i?. consimilis, Cr. 9 § , s. ; (4) B. edward- 
sii, Cr. 9 , s. ; (5) CUsodon terminalis, Cr. cJ^ 9 , s. ; (6) Antho- 
phora ahnipta, Say. cJ* , s. ; (7) Synhalonia atrivcntris, Sin. 9» 
12. H. Mueller. Alpenblumen, ihre Befruchtung, etc.. p. 394-395. 
13. C. Robertson. Flowers and Insects. XVIII. Bot. Gaz. Vol. XXV. (1898) p. 242. 
