There are 89 herbs that start with the letter O, from Oakmoss to Oyster Leaf. Below you will find them listed alphabetically along with some general information about each. Click the toggle view buttons in the top right corner to switch between the card and the table view.
For each item you will find the following information
Order: The subclass the herbs belongs to
Habitat: The places or type of weather the herbs lives in
Scientific name: The designation that scientists use to catalog the species
Name: Oakmoss
Order: Lecanorales
Habitat: Found on oak and other deciduous trees in Europe and North America
Scientific name: Evernia prunastri
Name: Oat Grass
Order: Poales
Habitat: Native to Europe and Asia
Scientific name: Arrhenatherum elatius
Name: Oblong-leaf Mint
Order: Lamiales
Habitat: Native to Europe and Asia
Scientific name: Mentha x piperita var. citrata
Name: Ocimum africanum
Order: Lamiales
Habitat: Native to tropical and southern Africa
Scientific name: Ocimum africanum
Name: Ocimum americanum
Order: Lamiales
Habitat: Native to Asia and Africa
Scientific name: Ocimum americanum
Name: Ocimum basilicum
Order: Lamiales
Habitat: Native to tropical Asia and Africa
Scientific name: Ocimum basilicum
Name: Ocimum gratissimum
Order: Lamiales
Habitat: Native to tropical Asia and Africa
Scientific name: Ocimum gratissimum
Name: Ocimum kilimandscharicum
Order: Lamiales
Habitat: East Africa
Scientific name: Ocimum kilimandscharicum
Name: Ocimum minimum
Order: Lamiales
Habitat: Native to India and the Middle East
Scientific name: Ocimum minimum
Name: Ocimum tenuiflorum
Order: Lamiales
Habitat: Native to tropical Asia
Scientific name: Ocimum tenuiflorum
Name: Ocimum x citriodorum
Order: Lamiales
Habitat: Hybrid
Scientific name: Ocimum x citriodorum
Name: Ocotea bullata
Order: Laurales
Habitat: Southern Africa
Scientific name: Ocotea bullata
Name: Ocotea odorifera
Order: Laurales
Habitat: Brazil
Scientific name: Ocotea odorifera
Name: Ocotea quixos
Order: Laurales
Habitat: Native to Ecuador and Peru
Scientific name: Ocotea quixos
Name: Ocotea rubra
Order: Laurales
Habitat: Native to the Caribbean and Central America
Scientific name: Ocotea rubra
Name: Ocotea usambarensis
Order: Laurales
Habitat: Native to East Africa
Scientific name: Ocotea usambarensis
Name: Ocotea veraguensis
Order: Laurales
Habitat: Central America
Scientific name: Ocotea veraguensis
Name: Ocotillo
Order: Caryophyllales
Habitat: Native to southwestern North America
Scientific name: Fouquieria splendens
Name: Ocotillo Cactus
Order: Caryophyllales
Habitat: Southwestern North America
Scientific name: Fouquieria splendens
Name: Odontites litoralis
Order: Lamiales
Habitat: Native to coastal regions of Europe
Scientific name: Odontites litoralis
Name: Odontites verna
Order: Lamiales
Habitat: Native to Europe and Asia
Scientific name: Odontites verna
Name: Odontites vernus
Order: Lamiales
Habitat: Europe
Scientific name: Odontites vernus
Name: Oenanthe aquatica
Order: Apiales
Habitat: Europe
Scientific name: Oenanthe aquatica
Name: Oenanthe crocata
Order: Apiales
Habitat: Europe
Scientific name: Oenanthe crocata
Name: Oenanthe fistulosa
Order: Apiales
Habitat: Native to Europe and Asia
Scientific name: Oenanthe fistulosa
Name: Oenanthe javanica
Order: Apiales
Habitat: Asia
Scientific name: Oenanthe javanica
Name: Oenanthe sarmentosa
Order: Apiales
Habitat: North America
Scientific name: Oenanthe sarmentosa
Name: Oenothera biennis
Order: Myrtales
Habitat: Native to North America
Scientific name: Oenothera biennis
Name: Oenothera caespitosa
Order: Myrtales
Habitat: North America
Scientific name: Oenothera caespitosa
Name: Oenothera cespitosa
Order: Myrtales
Habitat: Native to western North America
Scientific name: Oenothera cespitosa
Name: Oenothera elata
Order: Myrtales
Habitat: Native to western North America
Scientific name: Oenothera elata
Name: Oenothera fruticosa
Order: Myrtales
Habitat: North America
Scientific name: Oenothera fruticosa
Name: Oenothera glazioviana
Order: Myrtales
Habitat: South America
Scientific name: Oenothera glazioviana
Name: Oenothera laciniata
Order: Myrtales
Habitat: Native to eastern and central North America
Scientific name: Oenothera laciniata
Name: Oenothera lamarckiana
Order: Myrtales
Habitat: Native to Europe
Scientific name: Oenothera lamarckiana
Name: Oenothera macrocarpa
Order: Myrtales
Habitat: Central United States
Scientific name: Oenothera macrocarpa
Name: Oenothera pallida
Order: Myrtales
Habitat: Western North America
Scientific name: Oenothera pallida
Name: Oenothera pilosella
Order: Myrtales
Habitat: Native to southwestern North America
Scientific name: Oenothera pilosella
Name: Oenothera speciosa
Order: Myrtales
Habitat: North America
Scientific name: Oenothera speciosa
Name: Oenothera triloba
Order: Myrtales
Habitat: Central and Eastern United States
Scientific name: Oenothera triloba
Name: Oenothera versicolor
Order: Myrtales
Habitat: South America
Scientific name: Oenothera versicolor
Name: Oenothera villosa
Order: Myrtales
Habitat: Native to North America
Scientific name: Oenothera villosa
Name: Ogalala Mint
Order: Lamiales
Habitat: Great Plains of North America
Scientific name: Mentha arvensis
Name: Ohelo Berry
Order: Ericales
Habitat: Native to Hawaii
Scientific name: Vaccinium reticulatum
Name: Ohlone Mint
Order: Lamiales
Habitat: Endemic to California
Scientific name: Monardella villosa
Name: Okenia hypogaea
Order: Caryophyllales
Habitat: Native to Mexico
Scientific name: Okenia hypogaea
Name: Okinawa Spinach
Order: Caryophyllales
Habitat: Native to Southeast Asia
Scientific name: Gynura bicolor
Name: Okoubaka aubrevillei
Order: Santalales
Habitat: West Africa
Scientific name: Okoubaka aubrevillei
Name: Okra
Order: Malvales
Habitat: Tropical and Subtropical regions
Scientific name: Abelmoschus esculentus
Name: Oldenlandia diffusa
Order: Gentianales
Habitat: Asia
Scientific name: Oldenlandia diffusa
Name: Olea woodiana
Order: Lamiales
Habitat: Africa
Scientific name: Olea woodiana
Name: Oleander
Order: Gentianales
Habitat: Native to the Mediterranean region
Scientific name: Nerium oleander
Name: Oleaster
Order: Zygophyllales
Habitat: Native to western Asia and parts of Europe
Scientific name: Elaeagnus angustifolia
Name: Oleo Gum Resin
Order: Sapindales
Habitat: Northeast Africa and Arabia
Scientific name: Commiphora myrrha
Name: Oleo Resin
Order: Apiales
Habitat: Africa
Scientific name: Commiphora africana
Name: Oliganthes diversifolia
Order: Asterales
Habitat: Native to Mexico and Central America
Scientific name: Oliganthes diversifolia
Name: Olive
Order: Lamiales
Habitat: Native to the Mediterranean region
Scientific name: Olea europaea
Name: Olneya tesota
Order: Fabales
Habitat: Native to southwestern North America
Scientific name: Olneya tesota
Name: Olympus Tea
Order: Ericales
Habitat: Endemic to the Sierra Nevada mountains in California
Scientific name: Sarcodes sanguinea
Name: Omphalodes cappadocica
Order: Boraginales
Habitat: Asia Minor
Scientific name: Omphalodes cappadocica
Name: Onion
Order: Asparagales
Habitat: Worldwide
Scientific name: Allium cepa
Name: Onion Chives
Order: Asparagales
Habitat: Native to Europe and Asia
Scientific name: Allium schoenoprasum
Name: Onion Grass
Order: Asparagales
Habitat: Europe and Western Asia
Scientific name: Allium vineale
Name: Onobrychis viciifolia
Order: Fabales
Habitat: Eurasia
Scientific name: Onobrychis viciifolia
Name: Ononis spinosa
Order: Fabales
Habitat: Europe
Scientific name: Ononis spinosa
Name: Ooba
Order: Herbs
Habitat: East Asia
Scientific name: Macleaya cordata
Name: Oosik
Order: Herbs
Habitat: Western North America
Scientific name: Oplopanax horridus
Name: Ophiopogon japonicus
Order: Asparagales
Habitat: Native to East Asia
Scientific name: Ophiopogon japonicus
Name: Opium Poppy
Order: Papaverales
Habitat: Native to the Mediterranean region
Scientific name: Papaver somniferum
Name: Oplismenus
Order: Herbs
Habitat: Tropical regions
Scientific name: Oplismenus hirtellus
Name: Oplopanax horridus
Order: Apiales
Habitat: Western North America
Scientific name: Oplopanax horridus
Name: Opuntia engelmannii
Order: Caryophyllales
Habitat: Native to southwestern North America
Scientific name: Opuntia engelmannii
Name: Opuntia ficus-indica
Order: Caryophyllales
Habitat: Mexico and Central America
Scientific name: Opuntia ficus-indica
Name: Opuntia fragilis
Order: Caryophyllales
Habitat: Native to North America
Scientific name: Opuntia fragilis
Name: Opuntia humifusa
Order: Caryophyllales
Habitat: Native to eastern and central North America
Scientific name: Opuntia humifusa
Name: Opuntia phaecantha
Order: Caryophyllales
Habitat: Native to southwestern North America
Scientific name: Opuntia phaecantha
Name: Orach
Order: Caryophyllales
Habitat: Temperate regions
Scientific name: Atriplex hortensis
Name: Orange Bergamot
Order: Herbs
Habitat: North America
Scientific name: Monarda citriodora
Name: Orange Mint
Order: Herbs
Habitat: Hybrid
Scientific name: Mentha x piperita var. citrata
Name: Orange Tarragon
Order: Herbs
Habitat: Temperate regions
Scientific name: Artemisia dracunculus
Name: Orchard Grass
Order: Herbs
Habitat: Eurasia
Scientific name: Dactylis glomerata
Name: Oregano
Order: Lamiales
Habitat: Mediterranean region
Scientific name: Origanum vulgare
Name: Oregano Thyme
Order: Lamiales
Habitat: Native to the Mediterranean region
Scientific name: Origanum onites
Name: Orelia
Order: Herbs
Habitat: West Africa
Scientific name: Orelia nigerica
Name: Oriental Ginger
Order: Herbs
Habitat: East Asia
Scientific name: Zingiber mioga
Name: Origanum onites
Order: Lamiales
Habitat: Mediterranean region
Scientific name: Origanum onites
Name: Orris Root
Order: Asparagales
Habitat: Mediterranean region
Scientific name: Iris germanica
Name: Osha
Order: Herbs
Habitat: Western North America
Scientific name: Ligusticum porteri
Name: Oyster Leaf
Order: Brassicales
Habitat: Coastal regions
Scientific name: Mertensia maritima
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Oakmoss | Lecanorales | Found on oak and other deciduous trees in Europe and North America | Evernia prunastri |
| Oat Grass | Poales | Native to Europe and Asia | Arrhenatherum elatius |
| Oblong-leaf Mint | Lamiales | Native to Europe and Asia | Mentha x piperita var. citrata |
| Ocimum africanum | Lamiales | Native to tropical and southern Africa | Ocimum africanum |
| Ocimum americanum | Lamiales | Native to Asia and Africa | Ocimum americanum |
| Ocimum basilicum | Lamiales | Native to tropical Asia and Africa | Ocimum basilicum |
| Ocimum gratissimum | Lamiales | Native to tropical Asia and Africa | Ocimum gratissimum |
| Ocimum kilimandscharicum | Lamiales | East Africa | Ocimum kilimandscharicum |
| Ocimum minimum | Lamiales | Native to India and the Middle East | Ocimum minimum |
| Ocimum tenuiflorum | Lamiales | Native to tropical Asia | Ocimum tenuiflorum |
| Ocimum x citriodorum | Lamiales | Hybrid | Ocimum x citriodorum |
| Ocotea bullata | Laurales | Southern Africa | Ocotea bullata |
| Ocotea odorifera | Laurales | Brazil | Ocotea odorifera |
| Ocotea quixos | Laurales | Native to Ecuador and Peru | Ocotea quixos |
| Ocotea rubra | Laurales | Native to the Caribbean and Central America | Ocotea rubra |
| Ocotea usambarensis | Laurales | Native to East Africa | Ocotea usambarensis |
| Ocotea veraguensis | Laurales | Central America | Ocotea veraguensis |
| Ocotillo | Caryophyllales | Native to southwestern North America | Fouquieria splendens |
| Ocotillo Cactus | Caryophyllales | Southwestern North America | Fouquieria splendens |
| Odontites litoralis | Lamiales | Native to coastal regions of Europe | Odontites litoralis |
| Odontites verna | Lamiales | Native to Europe and Asia | Odontites verna |
| Odontites vernus | Lamiales | Europe | Odontites vernus |
| Oenanthe aquatica | Apiales | Europe | Oenanthe aquatica |
| Oenanthe crocata | Apiales | Europe | Oenanthe crocata |
| Oenanthe fistulosa | Apiales | Native to Europe and Asia | Oenanthe fistulosa |
| Oenanthe javanica | Apiales | Asia | Oenanthe javanica |
| Oenanthe sarmentosa | Apiales | North America | Oenanthe sarmentosa |
| Oenothera biennis | Myrtales | Native to North America | Oenothera biennis |
| Oenothera caespitosa | Myrtales | North America | Oenothera caespitosa |
| Oenothera cespitosa | Myrtales | Native to western North America | Oenothera cespitosa |
| Oenothera elata | Myrtales | Native to western North America | Oenothera elata |
| Oenothera fruticosa | Myrtales | North America | Oenothera fruticosa |
| Oenothera glazioviana | Myrtales | South America | Oenothera glazioviana |
| Oenothera laciniata | Myrtales | Native to eastern and central North America | Oenothera laciniata |
| Oenothera lamarckiana | Myrtales | Native to Europe | Oenothera lamarckiana |
| Oenothera macrocarpa | Myrtales | Central United States | Oenothera macrocarpa |
| Oenothera pallida | Myrtales | Western North America | Oenothera pallida |
| Oenothera pilosella | Myrtales | Native to southwestern North America | Oenothera pilosella |
| Oenothera speciosa | Myrtales | North America | Oenothera speciosa |
| Oenothera triloba | Myrtales | Central and Eastern United States | Oenothera triloba |
| Oenothera versicolor | Myrtales | South America | Oenothera versicolor |
| Oenothera villosa | Myrtales | Native to North America | Oenothera villosa |
| Ogalala Mint | Lamiales | Great Plains of North America | Mentha arvensis |
| Ohelo Berry | Ericales | Native to Hawaii | Vaccinium reticulatum |
| Ohlone Mint | Lamiales | Endemic to California | Monardella villosa |
| Okenia hypogaea | Caryophyllales | Native to Mexico | Okenia hypogaea |
| Okinawa Spinach | Caryophyllales | Native to Southeast Asia | Gynura bicolor |
| Okoubaka aubrevillei | Santalales | West Africa | Okoubaka aubrevillei |
| Okra | Malvales | Tropical and Subtropical regions | Abelmoschus esculentus |
| Oldenlandia diffusa | Gentianales | Asia | Oldenlandia diffusa |
| Olea woodiana | Lamiales | Africa | Olea woodiana |
| Oleander | Gentianales | Native to the Mediterranean region | Nerium oleander |
| Oleaster | Zygophyllales | Native to western Asia and parts of Europe | Elaeagnus angustifolia |
| Oleo Gum Resin | Sapindales | Northeast Africa and Arabia | Commiphora myrrha |
| Oleo Resin | Apiales | Africa | Commiphora africana |
| Oliganthes diversifolia | Asterales | Native to Mexico and Central America | Oliganthes diversifolia |
| Olive | Lamiales | Native to the Mediterranean region | Olea europaea |
| Olneya tesota | Fabales | Native to southwestern North America | Olneya tesota |
| Olympus Tea | Ericales | Endemic to the Sierra Nevada mountains in California | Sarcodes sanguinea |
| Omphalodes cappadocica | Boraginales | Asia Minor | Omphalodes cappadocica |
| Onion | Asparagales | Worldwide | Allium cepa |
| Onion Chives | Asparagales | Native to Europe and Asia | Allium schoenoprasum |
| Onion Grass | Asparagales | Europe and Western Asia | Allium vineale |
| Onobrychis viciifolia | Fabales | Eurasia | Onobrychis viciifolia |
| Ononis spinosa | Fabales | Europe | Ononis spinosa |
| Ooba | Herbs | East Asia | Macleaya cordata |
| Oosik | Herbs | Western North America | Oplopanax horridus |
| Ophiopogon japonicus | Asparagales | Native to East Asia | Ophiopogon japonicus |
| Opium Poppy | Papaverales | Native to the Mediterranean region | Papaver somniferum |
| Oplismenus | Herbs | Tropical regions | Oplismenus hirtellus |
| Oplopanax horridus | Apiales | Western North America | Oplopanax horridus |
| Opuntia engelmannii | Caryophyllales | Native to southwestern North America | Opuntia engelmannii |
| Opuntia ficus-indica | Caryophyllales | Mexico and Central America | Opuntia ficus-indica |
| Opuntia fragilis | Caryophyllales | Native to North America | Opuntia fragilis |
| Opuntia humifusa | Caryophyllales | Native to eastern and central North America | Opuntia humifusa |
| Opuntia phaecantha | Caryophyllales | Native to southwestern North America | Opuntia phaecantha |
| Orach | Caryophyllales | Temperate regions | Atriplex hortensis |
| Orange Bergamot | Herbs | North America | Monarda citriodora |
| Orange Mint | Herbs | Hybrid | Mentha x piperita var. citrata |
| Orange Tarragon | Herbs | Temperate regions | Artemisia dracunculus |
| Orchard Grass | Herbs | Eurasia | Dactylis glomerata |
| Oregano | Lamiales | Mediterranean region | Origanum vulgare |
| Oregano Thyme | Lamiales | Native to the Mediterranean region | Origanum onites |
| Orelia | Herbs | West Africa | Orelia nigerica |
| Oriental Ginger | Herbs | East Asia | Zingiber mioga |
| Origanum onites | Lamiales | Mediterranean region | Origanum onites |
| Orris Root | Asparagales | Mediterranean region | Iris germanica |
| Osha | Herbs | Western North America | Ligusticum porteri |
| Oyster Leaf | Brassicales | Coastal regions | Mertensia maritima |