A meadow's lush array of flowers needs a full phalanx of bees to pollinate them -- far more than just the honeybees and bumblebees that most people are familiar with, according to a new study by a team of researchers including University of Maryland entomologist Michael Roswell. A postdoctoral associate in the Department of Entomology, Roswell helped demonstrate that less common bees are much more important for ecosystem health than previously documented.