224 Contribution to a Statistical Study of the Cruciferce 
rise to two stamens in each of these positions. Now, we find that, in certain 
flowers chorisis has only partially taken place and in others it has not occurred 
at all so that we have thus another three possibilities to consider. 
In describing the andrcecium, therefore, we must (1) define the position of 
each stamen to which we refer, (2) state the nature of the filament, (3) note the 
presence or absence of the anther and (i) emphasise the nature of the chorisis. 
Let us use the following symbols 1, \ and 0. 
{Filament, indicates that it is present and complete. 
Chorisis, indicates that it is total or complete. 
Anther, indicates that it is present. 
, „ , (Filament, indicates that it is only half-lenofth. 
h with reference to ■i^, . . . , . . , . , ° 
(Uhorisis, mdicates that it is only partial. 
rFilament, indicates that it is absent. 
0 with reference to \ Chorisis, indicates that it has not taken place. 
lAnther, indicates that it is absent. 
We have already fixed upon our nomenclature for the various positions ; these 
are 1 ; 2 ; 3.4; and 5.6. To avoid descriptions and at the same time give a 
graphic representation of the floral formula of the andrcecium the following 
system inight be adopted : 
(1) Place the whole floral formula within square brackets thus [ ]. 
(2) Place positions 1 ; 2 ; 3.4; and 5 . 6 within curled brackets thus { } ; and 
(8) Place individuals, i.e. 1, 2, 3, 4, 5 and 6, within rounded brackets thus ( ). 
Expanding this with reference to a normal flower we would have for the 
andrcecium only 
[I2j {2} {2}], 
or still further in the order of Filament, Chorisis, Anther, Stamen 
[Ki.o.i)(i.o.i)H(i.i.i)(i.i.i)}{(i.i.i)(i.i.i)}]. 
Or, taking an actual example from our data : 
Stamen number 1 is normal and complete, and there is no chorisis; stamen 
number 2 has a filament only half-length but the anther is present and complete, 
and there is no chorisis; stamen number 3 is normal and complete; stamen 
number 4 is only half-length but with a complete anther — chorisis between 
3 and 4 is complete ; stamens 5 and 6 are only half the normal length but have 
complete anthers — chorisis between 5 and 6 is complete. 
This would be represented thus : 
[{(i.o.i)(i. 0.1)1 
