"Asclepias syriaca" is a species of flowering plant. It is in the genus "Asclepias", the milkweeds. This species is native to southern Canada and of much of the conterminous eastern U.S., east of the Rocky Mountains, excluding the drier parts of the prairies.
Similar species: Gentianales
By Gary B
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Uploaded Mar 8, 2019. Captured Jul 17, 2015 08:37 in 4408 Miller Rd, Barnum, MN 55707, USA.
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Looks like Asclepias syriaca is "present" in Oregon (one county) but nowhere else on the West Coast. This fact sheet https://www.xerces.org/wp-content/uploads/2011/10/WA-milkweed-guide_XercesSoc1.pdf from the Xerces Society lists Washington Asclepias species with maps, too. Posted 6 years ago