seas of sunflowers bloom in fields and farms. The flowers, which grow at the top of long, one- to three-meter stems, appear to us to be somewhat uniform, with bright yellow rings of petals adorning ...

including many specialist bees, such as the blue-eyed, long-horned bee (Melissodes denticulatus), which feasts primarily on ironweed (Vernonia fasciculata), also a member of the sunflower family.