I knew it was not the common Red Yucca, Yucca parviflora, so asked the staff at the nursery and they said it was a Giant Red Yucca. Not really knowing if that response was correct, I bought the plant anyway because I liked the structure of the plant with thick filaments curling off the sides of the leafs.
This is how the plant looked when I bought it in late 2012. I searched the internet and decided it was probably Hesperaloe funifera. I would just need to wait until it bloomed to confirm its identification.
I noticed that the flowers open at night and close in the morning. Could this be the night blooming Hesperaloe nocturna? I thought so until I did some internet searching. Hesperaloe nocturna does not have stiff, upright leaves like my plant. My plant looks most like Hesperaloe funifera. The thing that keeps me from making a firm ID is that I cannot find any references that Hesperaloe funifera is a night bloomer. Maybe there is another variety that I do not know about?
The mystery continues.