This plant, also named as maguey and mezcal, is well known in this area of America, especially in Mexico, as you say, @velimir! They not only make tequila with it and it is medicinal, but also aguardiente de cocuy and even paper and cloves. In other words, its use is extremely varied. These species that you caught with your lens have the stalks (leaves) in development. There are some that can be big and fat, and they even grow flowers. Today you brought not only visual beauty, but also important information. Beautiful day.