common milkweed seed pod bursting open - asclepias syriaca

tetraophthalmus caterpillars northeastern swallowwort butterflies caterpillar midwestern oncopeltus asclepias butterfly flowering milkweeds perennial mountains excluding including important plexippus tetraopes euchaetes fasciatus undefined milkweed bursting commonly silkweed virginia rhizomes southern prairies syriaca species growing monarch beetles sources include tussock lygaeus common called flower clonal ramets insect native canada united states danaus kalmii