title: Preliminary studies on directing butterflies to pollinate red clover (Trifolium pratense L.).
mesh_terms: D000818:Animals; D002080:Butterflies / Q000502:physiology*; D005306:Fertilization; D007915:Lepidoptera / Q000502:physiology*; D006109:Poaceae / Q000502:physiology*; D011058:Pollen