Note 2 — INTRODUCTION.
Reading edition
In some instances diagrams and formulæ are given in explanation of the conformation of monstrous flowers; in general these require no further explanation than is given in the text, unless it be to state that the horizontal line—is intended to indicate the cohesion of the parts over which it is placed, while the vertical line | signifies the adhesion of the organs by whose side it is placed. The formula
S S S S S ------------------------ | P P P P P | | ST ST ST ST ST
shows that the sepals (S) are distinct, the petals (P) coherent, and the stamens (ST) adherent to the petals.