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| A bumble bee (probably Bombus affinis, Apidae, identified by Gary Parsons) foraging on spotted knapweed (Centaurea maculosa, Asteraceae). Also called star thistle, it is a good nectar plant for bees, but the plant is considered an agressive weed because it produces allelopathic chemicals to kill other nearby plants and creating a monoculture of itself. Beal Botanical Garden, MSU campus. August 7, 2003. | |||||
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