Butterfly-Weed (Asclepias tuberosa)  Division - Magnoliaphyta Class - Magnoliopsida Subclass - Asteridae Order - Gentianales Family - Asclepiadaceae Genus - Asclepias         Immature Large Milkweed Bugs (Oncopeltus fasciatus in Nymph stage), which feed on milkweed seeds.  Taxonomic List List by Scientific Name Text Only List by Scientific Name |