
IN TREWIA. 17 
In one instance, a single stamen was developed on one side 
of the additional flower. 
Hence it is worthy of enquiry, whether the so-called calyx 
is not rather an involucrum. 
The presence of the bractea on the pedicel proves that 
the inflorescence is not simple from the axilla of the leaf, 
and the occasional presence of another flower with another 
bractea shew that the inflorescence approaches in nature to 
that of the males. 
@.—Is the terminal flower of a raceme naked or suffult- 
ed by a bractea ? 
The calyx differs markedly from that of the male flowers ; 
it is tubular, irregularly 4, 5, 6-toothed at the apex, when 
4-toothed the divisions alternating with the stigmata: it- 
is subsequently ruptured by the growth of the styles and 
stigmata. I believe its estivation to be reducible to the 
valvate form. 
It may be here enquired whether the greater part of the 
instances of ruptured perianth (rupture commencing at the 
apex), do not occur in valvate estivations: the margins 
cohering firmly, and subsequently giving way in the direction 
of one of the teeth. 
The instances of calyptrate perianths, petals, etc. such as 
those of the Myrtacee, Vitis, etc. all rupture at the base. 
The structure of the pistillum is in some respects worthy 
of remark ; it is composed generally of 4, occasionally of 3 
carpellary leaves, the composition of entrant portions of which 
is not distinguishable. These do not coalesce in the axis 
towards the apex of the fruit, but a small space is left there. 
If the septa are pulled apart, each separates with a portion 
of the placenta, which is above the ovule produced into 
cellular lobed growth, covering pretty completely the fora- 
men of the ovulum. These placentary processes have a mark- 
ed resemblance with the processes of the stigma ! 
In the young pistillum there is a marked correspondence 
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