Clicking on Stamen in the Flower Parts drop-down menu will add it to the Flower Layers list.

When Stamen is highlighted in this list, the following attributes will all be accessible.

Main tab

Count

Allows you to increase or decrease the stamen count.

This image shows a stamen Count of 12.

Count raised to 48.

Position

Offset up or down, to adjust the position.

Ring Radius

You can make the ring radius wider or narrower, with the slider.

Distribution Mode

There are two different distribution types: Spiral and Whorled.

Spiral

The stamen are distributed in the natural Fibonacci spiral.