The Ocotillo. Pronounced like "oh-ka-tee-oh," is ubiquitous in the Southwest. It's nicknamed Coachwhip, which you can imagine would hurt if you were riding through a grove of these on a stagecoach and got whacked.
It has cool medicinal value. So if you're in the desert and have prostatic hypertrophy, edema, fatigue, frequency, hemorrhoids, pelvic congestion or variscosities, then grind up some of this to get your lymphatic system flowing! A pretty plant when it puts outs leaves.