Fascinating - I live in NM and have seen both the yucca blossoms but also what appear to be the same thing as those agave spears. I had assumed they were all yucca around these parts as the plants that give off the tall spear blossoms are smaller than the agave I’ve seen in Mexico and SoCal, but I’m thinking they are just another agave variety.
Great, I’ve been wondering what the shorter ones are. They look like the tall yuccas, but have thinner spines and never seem to get taller. Apparently they are Yucca baccata.
Also it’s interesting to identify the various types of spiny grass.