This is the flowering stalk of a species of agave commonly called a "Century Plant." Typical varieties only flower once, at the end of their lives. The plant will send out a branched, flowering stalk that can grow 25'-30'. This signals the impending death of the plant.
"The real voyage of discovery consists not in seeking new landscapes but in having new eyes." --Marcel Proust ………
In school, I was a visual learner....