(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] African Rue - White Sands National Monument (U.S. National Park ... [PAR] It was first recognized as an invasive species near Deming, New Mexico in ... 
dehulled seeds do produce an edible oil that is very similar to cottonseed oil.