Some may say it was the spirit of the plant in the jar. That's the most logical explanation in my opinion. You "took it in" to yourself when you "breathed in deeply over the top of the jar". It's the best way to invoke something. When I use herbs in my work I always taste them (as long as they're not toxic!) and smell them. Some people will eat certain herbs, drink them (as teas, infusions, spagyrics, etc.) or smoke them to internalize their energy and mingle spirits. It is in line with a physical invocation of the spirit! Of course, this is all done with full caution and understanding of the herbs used.
Cool vision--that's what it was, if you were still wondering. I assure you that you were still in your body. But what you experienced was no less real. I would definitely consider keeping these experiences less public, however. Spirits appreciate people that do not plaster their business all over the place. Keep a journal for your own personal records instead. Start with this entry. ;)
Key phrase to find more about your experience would be "plant spirit" or "plant spirit medicine". Most of the stuff online is new age but I honestly can't offer you a good resource because I was taught by my family. It is something half learned and half experienced. Once you take the time to observe and interact with nature on a deeper level, you won't find a use for books about it.