One last series of photographs from David Tarrant for the time being (thanks yet again, David). David writes: “This is Dasylirion acrotrichum, locally known as cucharilla. The flower spike photographs were taken much earlier this year. The base of the leaves has an attractive spoon shape (cucharilla means “little spoon” in Spanish). The leaf bases are collected to decorate structures called suchiles (spelling? I couldn't find other references – Daniel) and other religious offerings as seen on this one in El Charco del Ingenio from earlier this year.”
Two English common names for this species are green desert spoon and frayed sotol. Frayed is in reference to the leaf-tips, as the leaves terminate with several strands of dry fibrous tissue; photographs of the foliage can be seen on the Dasylirion page of Andrea and Friedrich Lohmüller's site.
Dasylirion acrotrichum is endemic to the deserts of Mexico. If you plan to do more online research on this species, note that the name Dasylirion acrotriche is also often used.