Hesperoyucca whipplei (by flora-file)
Docent trainees checking out the dead flower stalk of this plant. It flowered last year, and the plant is still hanging on despite the fact that it is monocarpic. It is slowly dying though. Like agaves, this plant dies after finishing the flower cycle. Despite this, the stalk is as thick as a tree and still looks very nice despite the flowers being long gone.