How did you find that out? I just looked at the wiki page and I think that I have Coleus amboinicus growing in my family's home! It grows very fast, it is hardy, easy to propagate, and has a nice strong flavor.
I haven't decided what my favorite genus of plants is.. And if you ask me tomorrow I will definitely change my answer.
I think I would pick Vachellia, which was formerly part of the Acacia genus. My reasons being:
Vachellia collinsii was common in the are that I grew up in. The plant has these big hollow thorns in which Pseudomyrmex ants reside, and the ants will protect the plant. It is a very powerful example of symbiosis. I would often show people how the ants would run towards my hand whenever I would put my hand on the plant. Here is a picture of an ant by the entrance of a thorn that I took a while ago:
Not only does the plant provide a home to the ants, but it even produces food for them! It will produce these unique specialized biological structures from the tips of it leaves called "beltian bodies", and their purpose is to feed the ants.
If this is not enough... Well, there's more! In 2008 a species of jumping spider, Bagheera kiplingi, was discovered to be living in this plant and feeding off the beltian bodies - this is the first and I believe only reported instance of a mainly herviborous spider!
AND if all of these spectacular examples of well-documented animal <-> plant interactions is not enough, the genus also contains Vachellia drepanolobium, which besides its very cool looking symbiotic thorns it also contains a large amount of DMT (~1.4% dry weight) in its bark.
