(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] Soap Tree Yucca - Texas Beyond History [PAR] Soap-tree yucca was used by native peoples as a source of food, fiber for 
basketry and cord, ...