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▶ Habenaria
Common name: False rein-orchid
▶ Hackelia
Common name: Stickseed
▶ Halogeton
Common name: Halogeton
▶ Hedera
Common name: English ivy
▶ Hedypnois
Common name: Cretanweed
▶ Helenium
Common name: Sneezeweed
▶ Helianthella
Common name: Little sunflower
▶ Helianthemum
Common name: Rock-rose
▶ Helianthus
Common name: Sunflower
▶ Heliopsis
Common name: Oxeye
▶ Heliotropium
Common name: Heliotrope
▶ Hemerocallis
Common name: Day-lily
▶ Heracleum
Common name: Cow-parsnip
▶ Hesperis
Common name: Mother-of-the-evening
▶ Heteranthera
Common name: Mud-plantain
▶ Heterotheca
Common name: False golden-aster
▶ Heuchera
Common name: Alumroot
▶ Hibiscus
Common name: Hibiscus
▶ Hieracium
Common name: Hawkweed
▶ Hippuris
Common name: Mare's-tail
▶ Hirschfeldia
Common name: Hoary-mustard
▶ Holcus
Common name: Velvetgrass
▶ Holodiscus
Common name: Oceanspray
▶ Holosteum
Common name: Jagged-chickweed
▶ Hordeum
Common name: Barley
▶ Houstonia
Common name: Bluet
▶ Houttuynia
Common name: Chameleon
▶ Humulus
Common name: Hops
▶ Hydrilla
Common name: Hydrilla
▶ Hydrocharis
Common name: Frogbit
▶ Hydrocotyle
Common name: Pennywort
▶ Hydrolea
Common name: Waterpod
▶ Hydrophyllum
Common name: Waterleaf
▶ Hylotelephium
Common name: Orpine
▶ Hymenoclea
Common name: Cheesebush
▶ Hyoscyamus
Common name: Henbane
▶ Hyparrhenia
Common name: Thatching-grass
▶ Hypericum
Common name: St. John'swort
▶ Hypochaeris
Common name: Cat's-ear
▶ Hyptis
Common name: Bush-mint
▶ Hyssopus
Common name: Hyssop