The following research request has come in, and I thought some people on the forums might be able to help Francisco: Francisco's contact information: The list is attached below. I don't _think_ there would be any regulations restricting the sending of seed to Mexico.
Does the seed have to be collected in Mexico, or just be of the listed species? If the latter, I can probably get seeds of Heracleum mantegazzianum and Holcus mollis, at least, maybe others.