I understand New Wisdom's warning, but I want to put things in perspective.
The rules specifically ban discussion about preparation or consumption of scheduled compounds, and this also applies in cases of compounds found naturally in plants that are controlled in some countries but not others, such as harmine or harmaline. It's also against the rules the discussion about extraction of actives from plant matter.
In STS we are aware that this might seem very strict to some users, and that (for instance) banning the talk about extraction of peppermint essential oils from peppermint leaves can appear excessive. However, enforcing a selective set of rules that would allow discussing the use of certain plants, or certain plant compounds, but not others, would inevitably fall into loopholes and contradictions due to the complex legal status of many substances across the world, and would be virtually impossible to implement. So for both practical and legal reasons, we prefer to err in the side of caution.
Since STS is specialized in gardening, botany and sustainability, and in allowing users to trade legal gardening goods, we want to remain on topic and to ask everyone to follow scrupulously the laws in STS, for everyone's safety.
This does not mean we cannot mention in a discussion the compounds present in a plant species. Passion flower, in particular, is widely sold legally and used in many countries (I can go to my local herbal store and buy a kilo, if I want) in spite of the controlled status of some of its purified actives. Bringing up the types of flavonoids/alkaloids/terpenoids or whatever can be found in a plant species, for instance in a Plant Datasheet or when it's relevant for a discussion, is perfectly okay as a matter of botanical and ethnological interest. However, we should avoid centering whole detailed discussions around that matter, since even if the extraction or use of plant actives is not explicitly mentioned, such discussions will easily imply that plants are being traded and grown for consumption mainly, and that's a message we do not endorse, and do not want to deliver in this community.
Thank you,
Mandrake