an "emerald" (see Molina), or a type of greenstone or a green obsidian blade, given that -itztli refers to obsidian blades and they have have a gray or a green tint (SW)
a cactus plant with large leaves that looked like feathers Patrizia Granziera, "Concept of the Garden in Pre-Hispanic Mexico," Garden History 29:2 (Winter 2001), 185–213.