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Botanical Name: Olea europaea Olive is a tree. People use the oil from the fruit and seeds, water extracts of the fruit, and the leaves to make med...

Botanical Name: Avena sativa Oat is a plant. People use the seed (oat), leaves and stem (oat straw), and bran (the outer layer of whole oats) to ma...

Botanical Name: Lippia graveolens Lippia graveolens, a species of flowering plant in the verbena family, Verbenaceae, is native to the southwestern...

Botanical Name: Camellia sinensis Oolong tea is a product made from the leaves, buds, and stems of the Camellia sinensis plant. This is the same pl...

Botanical Name: Berberis aquifolium Oregon grape is a plant. The root and root-like stem (rhizome) are used to make medicine. Oregon grape is used ...

Botanical Name: Citrus sinensis Sweet orange is a fruit. The peel and juice are used to make medicine. The peel of sweet orange is used to increase...

Botanical Name: Evernia prunastri Oak moss is the moss from a certain type of oak tree called Evernia prunastri. The moss is used to make medicine....

Botanical Name: Iris germanica Orris is a plant. The root is used to make medicine. Orris root is generally used in combination with other herbs an...

Botanical Name: Quercus alba Oak bark is the bark from several types of oak trees. It is used to make medicine. Oak bark is used as a tea for diarr...

Botanical Name: Citrus aurantium Sweet orange is a fruit. The peel and juice are used to make medicine. The peel of sweet orange is used to increas...