296 BOTANICAL GAZETTE [OCTOBER 
(fig. 17). After the antipodal cells disintegrate the basal region 
of the sac grows down into the chalaza. The growing portion is 
blunt or more or less triangular in outline, and but little narrower 
than the sac just above. The antipodal growth continues until 
the sac is over five times as long as it is wide (fig. 19). Following 
the development of this antipodal haustorium the sac widens in the 
region of the polar nuclei and assumes its mature shape (fig. 37). - 
During the origin and development of the female gametophyte 
the megasporangium hasbeen undergoing marked changes. The 
ovule begins to curve before the megaspore mother cell appears, 
and by the time its nucleus has reached the segmented spirem stage 
the ovule has attained the anatropous position. At this time the 
inner integument extends beyond the nucellus and forms a fairly 
deep micropyle (figs. 1-4, 6). The outer integument arises from 
the lower two-thirds of the inner integument, appearing as a swelling 
from the outer part of the latter (fig. 6). This swelling increases 
greatly in breadth and grows up until its apex is on a line with the 
tip of the inner integument. It never grows beyond this point to 
aid in forming the micropyle, and the two integuments become 
distinct only at the summit (figs. 9, 37). 
The origin of the outer integument in J. Sultani differs from 
the majority of plants and from the other species of Impatiens 
that have been studied. Miss Rarrr (37) in J. pallida and 
GUIGNARD (22) in J. parviflora both show the outer integument 
arising from the basal portion of the ovule and remaining through- 
out its length distinct from the inner. As a result of his study of 
I. balsamina, BRANDZA (g) states that the Balsaminaceae have but 
one integument, but BrunorTe (10) disagrees with BRANDzA and 
gives two integuments for this family. According to LoNGo,’ as 
cited by Miss Rarrt, this is the rule for the genus Impatiens, but 
the origin of the outer integument and its extension at the micro- 
pylar region appear to vary. From my study of the ovule of 
I. Sultant it can readily be seen how BRAnpza thought there was 
but one integument if I. balsamina is similar to J. Sultani in having 
the outer integument an outgrowth of the inner integument with 
only their tips free. 
tLonco, B., Richerche su le Impatiens. Annali Bot. 8:65-77. 1909. 
