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Helenium autumnale ~ Common Sneezeweed, Helen's Flower
Helianthus maximiliani ~ Maximillian Sunflower
Heliopsis helianthoides ~ Sunflower Heliopsis
Heliopsis helianthoides var. scabra 'Sommersonne' or 'Summer Sun' ~ Ox-Eye or Sunflower Heliopsis
Hemerocallis sp. ~ Daylily
Hesperis matronalis ~ Dames Rocket, Sweet Rocket or May Phlox
Hibiscus coccineus ~
Swamp Hibiscus, Scarlet Rose Mallow, Texas Star, Scarlet Hibiscus
Hypericum androsaemon or H. androsaemum var. Glacier ~ Tutsan or Purple St. John's Wort
Hypericum perforatum ~ St John's Wort