The site linked above contains the meanings from five different books so you can see how they have changed.
Some of the stranger ones include:
- Nightshade, which most would recognise as a poisonous plant, can mean "truth" or "bitter truth", my first thought would be a "Nightshade for truthers" thing, because of what they need to accept
- Adonis Vernalis apparently means 'bitter memories", would that be a flower for breaking up?
- The African Marigold means "vulgar minded", somewhat ironic considering that 'marigold' comes from stories relating to the Virgin Mary. Maybe it says something about her?
- Kalmia latifolia means "victory", perfect for a certain JREF thread...
If you can think up other examples, don't hesitate to say something.