1. Oat
  2. Ocimum basilicum
  3. Ocimum gratissimum
  4. Ocimum tenuiflorum
  5. Oenanthe pimpinelloides
  6. Oenothera biennis
  7. Oenothera fruticosa
  8. Oldenlandia umbellata
  9. Olea capensis
  10. Olea europaea
  11. Olive
  12. Onion
  13. Onoclea sensibilis
  14. Ononis repens
  15. Ononis rotundifolia
  16. Ononis spinosa
  17. Onopordum acanthium
  18. Onopordum illyricum
  19. Ophioglossum lusitanicum
  20. Ophioglossum vulgatum
  21. Ophrys insectifera
  22. Orchis mascula
  23. Orchis militaris
  24. Oregano
  25. Origanum dictamnus
  26. Origanum majorana
  27. Origanum onites
  28. Origanum syriacum
  29. Origanum vulgare
  30. Ornithogalum arabicum
  31. Ornithogalum nutans
  32. Ornithogalum pyrenaicum
  33. Ornithogalum umbellatum
  34. Ornithopus perpusillus
  35. Orobanche ramosa
  36. Orobanche uniflora
  37. Orontium aquaticum
  38. Oroxylum indicum
  39. Oryza sativa
  40. Osbeckia chinensis
  41. Osmunda claytoniana
  42. Osmunda regalis
  43. Osmundastrum cinnamomeum
  44. Osyris alba
  45. Ovieda spinosa
  46. Oxalis acetosella
  47. Oxalis corniculata
  48. Oxalis incarnata
  49. Oxalis pes-caprae
  50. Oxalis purpurea
  51. Oxalis stricta
  52. Oxalis violacea
  53. Oxybasis glauca
  54. Oxybasis rubra


Origanum vulgare

  • Oregano  (Origanum vulgare, also known as marjoram)
  • Used for: digestion, headache, colic, "nervous complaints", coughs and respiratory ailments, menstrual cramps,<wiki/List_of_medicinal_plants#cite_note-theherbbook-7"> and vaginal steaming
  • Benefits:
  • Studies show long-term use of oregano may reduce high cholesterol.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Studies show long-term use of oregano may kill the stomach parasites Blastocystis hominisEntamoeba hartmanni, and Endolimax nana.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Non-benefits:
  • A study suggested that oregano did not prevent bleeding in people with hemophilia.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • A study suggested that oregano did not speed or aid the wound healing process, though it did reduce skin stiffness and improve skin color.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Research: No other major research on oregano's health benefits has been conducted. Despite contrary claims, oregano has not been shown to help asthma, bronchitis, coughing, the flu, indigestion, painful menstrual periods, arthritis, headaches, or heart conditions.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Harmful effects:
  • Oregano is probably safe in food quantities.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Oregano is possibly unsafe in medicinal quantities during pregnancy, and may possibly cause miscarriage.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Oregano may increase the risk of bleeding, which may be problematic before surgery and in people with bleeding disorders.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Oregano can lower blood sugar levels, potentially problematic for diabetics.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • People can be allergic to oregano.<wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">
  • Oregano is a diuretic. <wiki/List_of_medicinal_plants#cite_note-WebMDOregano-170">


Oenothera biennis

  • Evening primrose oil  (Oenothera spp.)
  • Usage: Used for treatment of coughs and colds, depression, and skin irritation.<wiki/List_of_medicinal_plants#cite_note-theherbbook-7"> Useless for eczema,<wiki/List_of_medicinal_plants#cite_note-92"> but may help with breast pain.<wiki/List_of_medicinal_plants#cite_note-epo-93"> Insufficient evidence for any other conditions.
  • Harmful effects: Side effects may include upset stomach, nausea, diarrhea, and headache.<wiki/List_of_medicinal_plants#cite_note-epo-93">


Ocimum basilicum

  • Basil  (Ocimum basilicum); in TCM: luólè (羅勒):<wiki/List_of_medicinal_plants#cite_note-read-12">
  • Usage: vaginal steaming
  • Claimed to: reduce spasms, help expel farts, increase milk production, and it's tasty!<wiki/List_of_medicinal_plants#cite_note-theherbbook-7"> It has also been said to be spiritually cleansing.
  • Beneficial effects: In vitro, has been shown to be antioxidant, antiviral, and antimicrobial.<wiki/List_of_medicinal_plants#cite_note-pmid16506839-21"><wiki/List_of_medicinal_plants#cite_note-pmid16173941-22"><wiki/List_of_medicinal_plants#cite_note-pmid17342533-23"><wiki/List_of_medicinal_plants#cite_note-pmid15979235-24"> No clinical studies, yet, however.
  • Harmful effects: Lowers blood pressure and prevents clotting, which situationally might be good but is often bad. Little efficacy otherwise.<wiki/List_of_medicinal_plants#cite_note-25">



riganum vulgare oil

  • Oil of oregano  (Origanum vulgare, also known as marjoram oil)
  • Used as: an anti-fungal, anti-viral, anti-bacterial, abortifactant, anti-asthma, anti-malaria, antioxidant and anti-cold/flu/headache medication (take your pick). While it has a higher rate of success on malaria and bacteria on the skin than normal water, it has significantly less success than any standard over-the-counter antibiotic or medicinal anti-malaria drug.<wiki/List_of_medicinal_plants#cite_note-165"> As with most woo, there is always a glint of truth that gets warped into $$$$$.<wiki/List_of_medicinal_plants#cite_note-166"> It is a good antioxidant, but not more so than raw oregano, which tastes better and makes wicked salads. And, despite its name, it tastes absolutely foul (as this user will attest).
  • Harmful effects: Side effects may include gastrointestinal issues and allergic reactions.<wiki/Help:References" title="Help:References">


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