Dorsey: VARIATION IN FLORAL SfRUCTURES OF Vitis 47 
as yellowish or brownish dots around the base of the pedicel. 
In PLATE I, FIG. 7, 8, and 9, are shown some of the forms they 
assume in the staminate flower. In FIG. 7 (PLATE 1) the nectarifer- 
ous gland forms a distinct five-sided ridge around the abortive 
pistil; in FIG. 8 (PLATE 1) the glands protrude distinctly between 
the stamens; and in FIG. 1 (PLATE 1) they are shown in the perfect 
flower. Closely observed, this organ exhibits differences in almost 
every vine. 
VARIATION IN THE PISTIL: Where the number of stamens varies 
either above or below the usual number five, changes result in 
both the external and internal structure of the ovary. Externally 
the number of lateral surfaces of the pistil vary and correspond in 
number to the stamens. Internally there is associated with an 
for each stamen number, 4 berries that had five stamens, and all 
had two carpels; of the 29 berries that had six stamens 22 had 2 
carpels and 7 had three; 23 had seven stamens, and of these 15 
had 2 carpels and 8 had 3; 5 berries had eight stamens, one of 
which had 2 carpels and 4 had three. In the staminate flowers 
this relation, of course, would not hold. 
STRUCTURAL VARIATION IN THE STIGMA: A careful distittction 
does not seem to have been made by previous writers on this sub- 
ject between the stigma and pistil. Engelmann ('94) observes 
that ‘the sterile plants do bear male flowers with abortive pistils, 
so that while they never produce fruit themselves they may assist 
in fertilizing the others.” Booth ('02) states that “all of the 
Staminate flowers, so called, which I have observed, have small 
abortive pistils; which also conforms with the observations of 
Engelmann. Others report staminate flowers with no trace of 
Pistil remaining.” In the same publication he states further that 
“there is a vine on this station which bears both staminate and 
hermaphrodite flowers. Mr. N. B. White, Norwood, Mass., 
"eports that he has a male (?) Rip. X Lab. vine which has fruited 
twice in the last thirty years, the pistils evidently varying in 
