XXXiv BOTANY. 
ovary-cavity, at last meeting in the centre, when the pistil be- 
comes multilocular with axile placente. On the other hand, a 
multilocular pistil sometimes becomes unilocular by the breaking 
away of the partitions during growth. In such a case the pla- 
cente form a free central column, commonly called a (free central 
placenta (4, Fig. XXXIII). 
In other cases a free placental column of an entirely different 
origin occupies the axis of a unilocular but evidently polycarpel- 
lary pistil, In Anagallis, for example, the placental column 
Fie. XXXIV. Fie XXXV. 
Fig. XXXIV.—Flower of Shepherd’s Purse (Capsella), with superior ovary, 
and hypogynous stamens and perianth. ; 
Fig. ilies lower of waterlemon, with inferior ovary, and epigynous 
perianth. 
grows from the base of the ovary-cavity, and there is at no time 
a trace of partitions, 
Adnation of the Gyncecium.—The gynecium may be free from 
all the other organs of the flower, which are then said to be hypogy- 
nous, and the gynecium itself superior (Fig. XXXIV). Sometimes 
the growth of the broad flower-axis stops at its apex long before 
it does so in its marginal portions; a tubular ring is thus formed, 
carrying up calyx, corolla, and stamens, which are then said to 
be perigynous, and the gynecium half inferior. These terms are 
used also in the cases where the gynecium is similarly sur- 
