Oxalis is a huge genus in the Oxalidaceae family found in many parts of the world, but with a large number found in South Africa and South America. Oxalis was the subject of the PBS list topic of the week in November 2003. To read the introduction by Robin Attrill for this topic view this 
link. Another post with a lot of good background information on this subject was in this list post from David Victor. For the most recent comprehensive information about the names of the species see Clifton, 2004 in References
Oxalis collection. Collection of Oxalis species painted by botanical artist Zoë Carter from Nelson New Zealand. Photos by Bill Dijk who has kindly added the names in the second photo.
See these wiki pages Miscellaneous Oxalis - South African Oxalis A- F – South African Oxalis G-L – South African Oxalis M-O – South African Oxalis P-Z - South American Oxalis or click on the name in the table below to learn about some of the species.
Miscellaneous Oxalis - South African Oxalis A- F – South African Oxalis G-L – South African Oxalis M-O – South African Oxalis P-Z - South American Oxalis
More information about Oxalis is found on the websites listed below:
Andrew Broome's Oxalis site from New Zealand -- Monica's site from Denmark -- Bill Baird's site from the USA
Return to the PBS wiki Photographs And Information page.