Aspens had sprung up in the open patches, as well as opportunistic wildflowers like meadow arnica, with its floppy yellow blossoms, and scarlet - bearded penstemon, jauntily erect. (discovermagazine.com)
A variety of so - called long - tubed flowers, including penstemon, Indian paintbrush, clover, wild indigo, monkshood, bluebell, snapdragon, larkspur, and foxglove, require long - tongued bumblebees for pollination. (sciencemag.org)
This occurred by independent evolutionary events, showing a relatively simple, predictable genetic change behind the evolution from blue to red penstemons. (sciencedaily.com)