Photo of the Day: A "Joshua Tree" (Yucca brevifolia) is a member of the agave family, and comes in many varieties. This variety is covered in razor sharp spines. . . . #POTD #photooftheday #picoftheday #joshuatree #plant #botany #plantsofinstagram #NPS #NPS100 #joshuatreenationalpark #nationalpark #desert #flowers #nature #naturephotography