I think there are 2 species in my yard, but really don't know for sure, or which ones. I love them too! If I want a spot in a bed where one is growing for something else, they're easy to dig up, the giant roots rarely break, once the soil is heaved up from under them. I was there to dig a hole anyway, easy peasy.
I like to put them around the edges of taller entities that are just in the lawn, not in a bed. The ring of spiderwort can be left unmowed until it gets too hot & stops blooming, then mowed with the rest of the lawn until next spring.
Bees are always so busy at the blooms in the spring, a valuable native to them for sure.