Eichler inspired later generation of scientists, including John Henry Schaffner.

They were used in different textbooks, e.g. Organogenesis of Flowers[7] by Rolf Sattler (1973), Botanische Bestimmungsübungen[8] by Stützel (2006) or Plant Systematics[9] by Simpson (2010).

Floral Diagrams[1] (2010) by Ronse De Craene followed Eichler’s approach using the contemporary[Note 1] APG II system.

[3] It usually shows the number of floral parts,[Note 2] their sizes, relative positions and fusion.

The diagram may also include symbols that don’t represent physical structures, but carry additional information (e.g. symmetry plane orientation).

There is no agreement on how floral diagrams should be drawn, it depends on the author whether it is just a rough representation, or whether structural details of the flower are included.

[1]: xiii Diagrams are usually depicted with the subtending bract below and the axis above the flower itself, both in the median line.

In Floral Diagrams by Ronse De Craene they consistently have a black fill and a little triangle on the outer side to distinguish them from the perianth.

The axis relative to the flower is shown as black circle in Floral Diagrams.

Ronse De Craene implies that it may be sometimes impossible to classify the organs, he shows green perianth parts as black and pigmented as white.

Ronse De Craene also incorporates ovule morphology or shows the position of stigmatic lobes by white shapes.

Prenner et al. view them as complementary methods and state they make an “identikit” flower when utilized together.