Polygala polygama and P. paucifiora. 139 
the same position as in the former case, and is a receptacular 
development sheltered by the posterior sepal. To the naked 
eye itis visible as a prominent bilobed papilla. In section it 
appears as a many layered cell-mass, receiving branches of 
the vascular system. 
B. CLEISTOGAMIC FLOWER. 
At the same time that the conspicuous flowers appear slen- 
der, lateral branchlets arise from the leafy shoots near the 
surface of the soil, bearing a small number of minute flowers. 
Oddly enough, these branchlets seem as a rule to be apogeo- 
tropic, though no exact experiments have yet been attempted. 
Only one or two of these lateral branchlets are produced 
from one axis, and rarely more than three flowers are borne 
by either of them, so that the number of cleistogamic flowers 
is very small. The contrast in size between these and the 
evident flowers is great, the former measuring scarce a milli- 
meter in length. 
Calyx.—Five sepals are represented. The lateral ones— 
wings of the evident flowers—are about twice the size of the 
other three, which are nearly uniform. All are deciduous. 
Stomata are present on all,and quite abundantly on the outer 
surfaces. 
Corolla.—There is no trace of any of the petals except the 
anterior. This is represented by a small process. 
Andrecium.—tThe six stamens of the chasmogamic flower 
are commonly all represented, always some of them being in 
a more or less rudimentary condition. The microspores are 
also reduced in size, measuring about twenty-five p in 
diameter. 
Gynecium.—Here the reduction in size is also relatively very 
great. The style has almost disappeared, and the ovary is 
about one-fifth the length of that of the chasmogamic flower. 
No glandular hairs are present. 
