Over at LiveScience, my collaborator Chris Smith describes the research we’ve done so far on the interaction between Joshua trees and their pollinators:
First, the match between the Joshua tree flowers and the moths’ ovipositors suggested that coevolution might have molded the relationship between the plant and the pollinator. Second, because the plants are completely dependent on the moths for reproduction, the differences in the flowers might have caused Joshua trees to split into two different species.
Yucca brevifolia in Tikaboo Valley, Nevada. Photo by jby.