Thank you Utah Xeric Man! This looks to be a wonderful, dangerous place for people like me.
That's quite a tempting list. One day I'd like to try S. guaranitica. I bought some Eremurus babies a few years ago that grew into Kniphofia. Kind of ironic since I'd been unsuccessful two years in a row in trying to get K. caulescens to overwinter. Maybe this is the year I try for a species ID on our Eremurus-Kniphofia