452 
in that position (fig. 70). 
BOTANICAL GAZETTE 
[JUNE 
Immediately the third whorl of 
papillae appears, the individual members alternating with the 
second, and forming the second cycle of stamens, smaller and 
shorter than the first, and at a greater distance from the floral 
center (fig. 9). 
2 
6 
"Spiraea Japonica, 
Assncetaa section of a pont spike, 
_ Cae 
iccck one 
he center 7, a —_ showing three stamens. 
ndinal section « of Hie same flower 
Contemporaneously with the second whorl of 
papillae, and while 
the first three whorls 
have as yet merely 
roughened the sur- 
face of the floral 
protuberance, two 
ridges, each strongly 
curved and with con- 
_cave parts facing 
each other, arise at 
the center of the re- 
ceptacle (fg. 7): 
These ridges fail to 
develop on the inner 
face except at their 
extremities, and the 
result is two carpels 
with cavities facing 
each other and nearly 
filled by. the large 
development of the 
ridge-ends, which 
form the placentae. 
The transverse sec- 
tions in figs. 8 and 9 
show this cavity, and 
how itis filled by the 
placentae before ne me 
0 | a . Aibeokh there are five carpels in 
lia and two i in S. Japonica, leaving opportunity for 
70 to five, no evidence | was bain of the cae 
