Plant image gallery. You'll find a list of all photos in this section here. Click on the headers for the galleries.
Click here for information about Ophiocordyceps.
Click here for information about Ophioglossum.
Click here for information about Oplopanax.
Click here for information about Opopanax.
Click here for information about Opuntia.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.