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https://en.wikipedia.org/wiki/Poppy_tea

Oregano...or is it Marjoram?

Let's start out with the fact that all marjorams are oreganos, since the genus name for both is origanum, but not all oreganos are marjorams. Certainly some of the overlapping comes from the fact that marjoram used to have its own genus. Now oregano is the genus and marjoram, or sweet marjoram (Origanum majorana) is only one variety of over fifty types of oregano. Pot marjoram (Origanum onites) is another variety, but even this causes confusion, sometimes being called Cretan oregano because of its place of origin. There is even confusion outside the genus itself. In Puerto Rico there is a variety of coleus (Coleus anboinicus) which is marketed as oregano and often used in combination with bay leaf and celery as a traditional Cuban seasoning. In Spain there is Thymus nummularius, and in Mexico there is Lippia graveolens; both sold and used in place of oregano. One last example of how it all gets jumbled: Origanum vulgare, or what is taken for common oregano, is also known as wild marjoram!
http://www.sallybernstein.com/food/columns/gilbert/oregano.htm