1. Haemanthus coccineus
  2. Haematoxylum campechianum
  3. Halimione portulacoides
  4. Halleria lucida
  5. Hamamelis virginiana
  6. Hammarbya paludosa
  7. Hasteola suaveolens
  8. Hedera helix
  9. Hedypnois rhagadioloides
  10. Hedysarum alpinum
  11. Hedysarum coronarium
  1. Helianthus annuus
  1. Helianthus decapetalus
  1. Helianthus tuberosus
  1. Helicteres isora
  2. Helictotrichon pratense
  3. Heliocarpus americanus
  4. Heliopsis helianthoides
  5. Heliotropium curassavicum
  6. Heliotropium europaeum
  7. Heliotropium indicum
  8. Helleborus foetidus
  9. Helleborus niger
  1. Helminthostachys zeylanica
  2. Helminthotheca echioides
  3. Helonias bullata
  4. Hemerocallis fulva
  5. Hemidesmus indicus
  6. Henna
  7. Heracleum sphondylium
  8. Herminium monorchis
  9. Herniaria glabra
  1. Hesperis matronalis
  2. Heuchera americana
  3. Hexastylis virginica
  4. Hibiscus moscheutos
  5. Hibiscus mutabilis
  6. Hibiscus rosa-sinensis
  7. Hibiscus sabdariffa
  8. Hibiscus syriacus
  9. Hibiscus tilliaceus
  10. Hibiscus trionum
  11. Hieracium alpinum
  12. Hieracium amplexicaule
  13. Hieracium gronovii
  14. Hieracium murorum
  15. Hieracium paniculatum
  16. Hieracium pilosella
  17. Hieracium sabaudum
  18. Hieracium venosum
  19. Himantoglossum hircinum
  1. Hippomane mancinella
  2. Hippomane spinosa
  3. Hippophae rhamnoides
  4. Hippuris vulgaris
  5. Hiptage benghalensis
  6. Holcus lanatus
  7. Holosteum umbellatum
  8. Homogyne alpina
  9. Honckenya peploides
  10. Honey locust
  11. Hordeum jubatum
  12. Hordeum murinum
  13. Hordeum vulgare
  14. Horminum pyrenaicum
  15. Hornungia procumbens
  16. Horseradish
  17. Hottonia palustris
  18. Houstonia caerulea
  19. Houstonia purpurea
  1. Huperzia phlegmaria
  2. Hura crepitans
  3. Hyacinthoides italica
  4. Hyacinthoides non-scripta
  5. Hyacinthus orientalis
  6. Hydrangea arborescens
  7. Hydrocharis morsus-ranae
  8. Hydrocotyle umbellata
  9. Hydrocotyle vulgaris
  1. Hylotelephium telephium
  2. Hymenaea courbaril
  3. Hymenocallis caribaea
  4. Hymenocallis caroliniana
  5. Hyoscyamus niger
  6. Hypericum androsaemum
  7. Hypericum balearicum
  8. Hypericum canariense
  9. Hypericum hirsutum
  10. Hypericum humifusum
  11. Hypericum mutilum
  12. Hypericum olympicum
  13. Hypericum perforatum
  14. Hypericum pulchrum
  15. Hyphaene thebaica
  16. Hypochaeris glabra
  17. Hypochaeris radicata
  18. Hypoxis hirsuta
  19. Hyssopus officinalis

 

Hypericum perforatum

  • St. John's wort (Hypericum perforatum)

See the main article on this topic: St. John's wort

  • Used for: calming, bedwetting, insomnia, "nervous conditions", depression, anemia, headache, jaundice, congestion, and menstrual difficulties<wiki/List_of_medicinal_plants#cite_note-theherbbook-7">
  • Regarded by herbalists and some medical authorities as an effective treatment for depression; trials are mixed, partly due to depression's high susceptibility to the placebo effect.<wiki/List_of_medicinal_plants#cite_note-204"><wiki/List_of_medicinal_plants#cite_note-205"> Popular in Germany. May interfere with effectiveness of other drugs.<wiki/List_of_medicinal_plants#cite_note-206">
  • Harmful effects: may cause cataracts in people exposed to visible or ultraviolet light after taking it.<wiki/List_of_medicinal_plants#cite_note-fordham-207"> Other side effects may include gastrointestinal disturbances, allergic reactions, fatigue, dizziness, confusion, dry mouth, photosensitivity<wiki/List_of_medicinal_plants#cite_note-aafp-90">, mania and psychosis<wiki/List_of_medicinal_plants#cite_note-maniapsychosis-20">

 

Hyoscyamus niger

  • Henbane  (Hyoscyamus niger)
  • Used for: pain, nervousness, irritability, Parkinson's disease symptoms, and ulcers.<wiki/List_of_medicinal_plants#cite_note-theherbbook-7"><wiki/List_of_medicinal_plants#cite_note-hen-123"> It is also smoked to "cure" asthma and bronchitis<wiki/List_of_medicinal_plants#cite_note-hen-123"> (sounds familiar). There is no evidence to support its use for any of these conditions.<wiki/List_of_medicinal_plants#cite_note-henmd-124">
  • Harmful effects: Henbane is toxic, and when used for self-treatment may result in fatal poisoning. Side effects may include dry mouth, red skin, constipation, overheating, reduced sweating, vision disturbances, increased heart rate, urination problems, drowsiness, restlessness, hallucinations, delirium, manic episodes, and death. Mostly death.
  • For a while, henbane berries were used in the manufacture of an herbal beer flavoring called "gruit", which was flavored with various sweet and bitter herbs, before people began using hops. Gruit fell out of favor during the Middle Ages when the Reinheitsgebot declared that all beers in the Holy Roman Empire could only be made with barely (Hordeum vulgare), hops (Humulus lupulus), water, and yeast.<wiki/List_of_medicinal_plants#cite_note-Rabin-125">

 

Hydrastis canadensis

  • Goldenseal  (Hydrastis canadensis)
  • Used for: vaginal douching, mouthwash, periodontal disease, congestion, laxative, stomach ailments, skin diseases, and nausea relief during pregnancy.<wiki/List_of_medicinal_plants#cite_note-theherbbook-7"> Also used for "immune system boosting".<wiki/Help:References" title="Help:References">
  • Effectiveness: The evidence doesn't suggest Goldenseal is effective for any condition.<wiki/List_of_medicinal_plants#cite_note-110">
  • Harmful effects: Small doses may be fine, except during pregnancy or breastfeeding, since goldenseal might cause brain damage to the baby.<wiki/List_of_medicinal_plants#cite_note-111">"High doses may cause breathing problems, paralysis, and even death. Long-term use may lead to vitamin B deficiency, hallucinations, and delirium."<wiki/List_of_medicinal_plants#cite_note-gscancer-112">It may also affect blood pressure unpredictably because it contains several different compounds that have opposite effects on blood pressure.<wiki/List_of_medicinal_plants#cite_note-gscancer-112"> It can also make you more sensitive to light.<wiki/List_of_medicinal_plants#cite_note-gscancer-112"> A cancer study of goldenseal root powder in mice and rats showed that it "caused cancer in the liver of male and female rats and male mice. There was no effect of goldenseal root powder on female mice."<wiki/List_of_medicinal_plants#cite_note-113">

 

Harpagophytum procumbens

  • Devil's claw  (Harpagophytum procumbens)
  • Usage: Effective for osteoarthritis pain.<wiki/List_of_medicinal_plants#cite_note-devil-84"> Insufficient study has been done to evaluate its effectiveness for anything else.<wiki/List_of_medicinal_plants#cite_note-devil-84">
  • Harmful effects: Side effects may include diarrhea, nausea, vomiting, abdominal pain, headaches, ringing in the ears, loss of appetite, and loss of taste.<wiki/List_of_medicinal_plants#cite_note-devil-84"> Other side effects may include allergic skin reactions, menstrual problems, and changes in blood pressure.<wiki/List_of_medicinal_plants#cite_note-devil-84"> Use of devil's claw during pregnancy is not advised, as it may harm the fetus.<wiki/List_of_medicinal_plants#cite_note-devil-84">

 

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