112 BOTANICAL GAZETTE [AUGUST 
Standard botanical treatments describe this species as having 
only perfect flowers. For over 50 years, however, sex polymor- 
phism has been recognized as present in the species. The tendency 
has been to group the individuals in 3 classes (LY¥DWIG 19), most 
recently designated by BARTLETT (2) as (1) first form hermaph- 
rodite, (2) second form hermaphrodite, and (3) female. CoRRENS 
(4), however, groups plants of this species grown from seed col- 
lected near Leipzig, Germany, into 5 classes, in two of which there 
was variation in single spikes (a) from hermaphrodite flowers to 
flowers with imperfectly developed stamens (+%), and (6) from 
more or less perfect flowers to flowers only female (+% and 9). 
In thus making these classes recognition is given by CORRENS 
to variations in sex organs which include various grades of 
gynomonoecism already observed in this species by ScHuLz (24). . 
The difficulty of making any adequate classification, expressed 
in some degree by Correns (4) and by BARTLETT (3), has been 
very apparent from the observations which the writer has made. 
In 1912 BARTLETT very kindly supplied me with plants which he 
classed under the 3 forms just noted. Seed progenies have been 
grown and observations made of plants growing wild: in the fields 
in and about the New York Botanical Garden, where P. lanceolata 
is exceedingly abundant. Study of this material reveals that 
there is present a wide range of variations in the development of 
sporophytic sex organs, which in its general aspects is quite iden- 
tical with the phenomenon of intersexualism especially described 
by GotpscumipT, BANTA, and by Davey and GIBsoN. 
DESCRIPTION OF THE THREE FORMS 
Flowers typical of the forms most generally recognized may 
first be described, as illustrating the two extremes and one inter- 
mediate. The flower drawn for a plant was in all cases selected 
from the middle portion of a spike, and was typical of a large 
number of flowers in bloom. The flower was placed on a glass 
slide, a large cover glass was placed over it to bring the various 
parts into somewhat the same plane, measurement was made 0 
the flower parts under very low magnification by ocular microm- 
