(Jon of the Clue Crew reports from White Sands National Monument, New Mexico.)  For desert trekkers in the Southwest, it might come in handy to know that the soaptree type of this stiff-leaved evergreen has edible flowers
[DOC] [TLE] Sand Dune Flora - Alamy [PAR] Desert landscape with grasses and red sand dunes, Sossusvlei, Namibia - Stock 
Image ... Soaptree yucca, White Sands National Monument, New Mexico.