FLOWERS AND INSECTS. XVII. 
CHARLES ROBERTSON. 
For a more extended title of this series I have adopted that 
of Contributions to an account of the ecological relations of the 
entomophilous flora and the anthophilous insect fauna of the 
neighborhood of Carlinville, Illinois.’ The following papets 
should be regarded as parts of the same series: Flowers and 
Insects: Umbelliferee. Trans. St. Louis Acad. Science 5:449-4 
1890; Asclepiadacez to Scrophulariacee, 72d. 5 2569-598. 1891; 
Labiate. ibid. 6: 101-131. 1892. (no. 4); Rosacea and Compost 
tae, eid. 6: 435-480. 1894. (no. 14); Flowers and Insects, #id. 
7:151-179. 1896. (no. 6); The Philosophy of Flower Seasons, 
American Naturalist 29:97-117. 1895. The cases of some 
plants, such as those observed in Florida, which properly do not 
come under the title, are distinctly specified. eee 
The present paper discusses a number of plants, which, be 
although not akin, should be compared because of the ini ; 
ence which their greenish yellow colors have been considered (0 ‘s 
have in determining the character of the insect visits. a 
| CAULOPHYLLUM THALICTROIDES (L.) Michx. is a perennial plant, 
rather frequent in rich woods, and blooming a short time; Ap : 
430 to May 7th. Thestems grow several decimeters high and a 
single small loose panicles of yellowish green flowets: — 
flowers expand horizontally about 10™™, and, I think, remain ys 
at night. a short - 
Each of the six sepals has, lying upon its base #*” hae 
petal which is somewhat kidney-shaped, being expanded ae 
nectar gland as wide as the sepal. The style is very shor ew 
's tipped by a small stigma, which is receptive before the 
ers dehisce. From the shortness of the stamens, as well we 
later dehiscence, ] think that spontaneous self-pollination di ; 
not occur, According to the views usually held with i 
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