Yucca angustissima (Thin Leaved Yucca). Creamy white to yellowish flower with tinges of pink. 18' long linear leaves which are green with white margins.  Native to elevations of 4,300-4,500 feet. Grows to 2-3 feet tall with 3-5 foot spread with a flower stock up to 5 feet tall. 60-90 days cold moist stratification recomended.