The hardiest of the hardy Yuccas and the most wide spread.
I grew up seeing Y. Glauca on the short grass prairies of North and South Dakota. Most of the time the flowers are white blushed with pink. I have never come across any with darker pink flowers. Years ago I was reading in Claude A. Barr's 'Jewels of the Plains' that he was searching for some.(Is my poor memory correct?)
If so are any of the descendants of his selections around?