Is this Utah yucca (Yucca elata var. utahensis)? Or can it be Narrowleaf yucca (Yucca angustissima). Or maybe Utah yucca × Narrowleaf yucca hybrids? Photos were taken i South-western Utah in late May. Thank you for help with the identification. Paalo
The inflorescence looks paniculate and the distant plant has a trunk. I'd say, Y. elata. Varieties and hybrids are rather difficult to id from the picture.