Hola German , Thank you for determining this plant . Do you have maybe a picture of Z. mesochloa ? I have found in my papers only a description of Z. mesochloa in "Amaryllidaceae" from Arroyo/ Leuenberger - there is given : Argentina: Jujuy, San Lorenzo . This is some Km from this location who comes my plants. I also grow seedlings of Z. mesochloa from seed from AGS -they looks a little bit other ( the leaves are narrow by my plants ) -but this is maybe the natural variation . With best wishes Hans