110 THE AMERICAN MIDLAND NATURALIST 
DISK: The hypogynous disk is distinctly 5-lobed ; each lobe 
is reflexed and manifestly emarginate. 
ANDROECIUM: The androecium consists of twice as 
many stamens as there are members in the calyx, corolla and 
pistil. The stamens opposite the sepals are inserted below the 
disk, those opposite the sepals apparently between the lobes 
of the disk. The anthers are adnate, the connective is mani- 
fest and rather stout in comparison to the size of the anther 
which is transversely 2-saccate with one sac superposed above 
the other, the sacs facing introrsely. The connective is gener- 
ally reddish or brownish-purple, the sacs white or cream-color, 
becoming yellow at maturity. A shallow groove along the 
connective indicates the position of the vertical partition 
which is as long as the anther. It is not marked off along the 
introrse face of the anther, because it is only imperfectly de- 
veloped; its best development being in the region where it is 
crossed by the transverse partition. The transverse partition 
is small but for the first more complete than the vertical one 
and is responsible for the transverse constriction of the 
anther. As development of sporogenous tissue progresses, the 
sacs bulge out considerably and become confluent. The line of 
constriction does not become markedly obscured and the indi- 
vidual sacs are still recognizable at maturity. Before the 
anthers mature, two oval spaces become faintly marked off, 
one on each side of the connective, which develop into large 
pores through which the pollen is discharged. The partitions 
remain attached to the connective which, at maturity of the 
anther, loses its prominent character on account of exsiccation 
and of warping. With the approach of maturity the anther 
makes a turn of less than 90 degrees; thus the pores assume 
a terminal position. The filaments are at first somewhat stout 
but become filiform and are generally reddish or purplish. 
GYNOECIUM: The compound 5-(respectively 4-8-) car- 
pellate pistil is snow-white and of a firm waxy texture. The 
ovary is subglobose to globose-ovoid, slightly 5-( 4-8-) lobed 
by primary grooves and, in its lower part, 10-(8-16-) lobed 
through additional secondary grooves. The style is short, 
about 1.5 mm. long and thick, not hollow but inconspicuously 
