New Mexico's state flower (5)
I believe the answer is:
yucca
'new mexico's state flower' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yucca that I've seen before include "Ornamental plant" , "Evergreen plant with thick stout stems" , "Plant of the Agavaceae family" , "Tall, strong, evergreen plant" , "Tropical American liliaceous plant" .)