42 
BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 5, NO. 1. 
have come across specimens having the uppermost flower or the 
two uppermost flowers of the stem sterile i. e. with the style rudi- 
mentary or nearly wanting. This is the only example of an andro 
monoecious species of Salomonia (Polygonatiwi) hitherto re- 
ported. 
The humming-bird has been observed at the flowers, and three 
bees besides : 
A. Hymenoptera 
Apidse: (i) Bombits consimilis Cr., female, s. ; Andrenidae: 
(2) Halictiis forbesii Rob., female, s. ; (3) H. 4-maciilatiis Rob., 
female, s. and c. p. 
B. Aves. 
(4) TrochUus cohibris L., s. 
Trillium grandiflorum (Michx.) Salisb. Large-flowered Wake-robin. 
It is the commonest of our species of Trillium and is usually 
found in blossom from about May 6 to June 3. The large erect 
white flowers are among the most conspicuous of the spring flow- 
ers of our woodlands. They are proterandrous as shown by Loew 
(21), who studied them from plants growing in the Botanical Gar- 
den at Berlin. The anthers are 12 mm. long, two-thirds of this 
length being above the stigmas and one-third reaching down below 
the latter. Dehiscence begins above, and as soon as the stigma 
is reached spontaneous self-pollination undoubtedly takes place 
imless it has it has been preceded by self or cross-pollination 
through insects. In flowers in which the anthers have shed their 
pollen completely the stigmatic surfaces may be seen surrounded 
by pollen. According to Miss Alice Carter (22) nectar is secreted 
by septal glands, and in the plants examined in our neighborhood 
this is very clearly the case. Large drops are sometimes visible 
betw^een the septal furrows of the ovary and the petals, taking up 
the space around the bases of the filaments. We might expect 
these showy and sweet-scented flowers with an abundant supply of 
pollen and nectar to be decidedly attractive to insects, and still 
this is not the case. It is, on the contrary, quite astonishing how 
little attention is paid to them. The only insect ever seen by me 
21. E. Loew. Bluetenbiologdsche Beitraege II. Pringsh. Jahrb. 
Vol. XXIIL, pp. 78-79 (1892). 
22. Alice Carter. Notes on pollination. Bot. Gaz., Vol. XVII.,,. 
p 21 (1892). 
