https://www.usgs.gov/media/images/helianthus-angustifolius-l-2-swamp-sunflower
Helianthus angustifolius L. 2, Swamp Sunflower | U.S. Geological Survey
Kick butt pollinator plant. Put in your garden please. Helianthus angustifolius - Swamp sunflower. The perennial sunflowers are underappreciated, particularly...
helianthus angustifoliusswamp sunflower2geologicalsurvey