Purple/Pink Aquatic - Wetland Flowers

Joe Pie Weed (note red stem, opposite leaves, pointy lobe, several branches of small clustered flowers)
Image from: Iowa State University

Swamp Milk Weed (Note flatter leaver, opposite leaves, untoothed, lance shaped, (larger) petal flowers) Image from: Minnesota Seasons - Nature Tourism

Flowering Rush (Invasive) (Note all flowers come off stem, no leaves along stem all at bottom)
Image from: Toronto Wildlife

Purple Loosestrife (Invasive) (Note spire of small five-petaled flowers, alternate/whorled leaves)
Image from: Minnesota Department of Agriculture

Steeplebush - Hardhack (Note has light wooly hairs on bottom-side of leaf. Part of the Rose family as is Meadowsweet - a white version)


P.S. Check out my latest "urban wild" nature blog: Wild. Here. (2016 update)