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Two monarch butterflies sucking nectar on Common Milkweed, Asclepias syriaca. Of the 73 species of native milkweeds, this one is the most important for the monarch butterfly. (Photo courtesy of Ina Warren) Two monarch butterflies sucking nectar on Common Milkweed, Asclepias syriaca. Of the 73 species of native milkweeds, this one is the most important for the monarch butterfly.