Oxalis acetosella
- Two photographs of the delicate flower of Wood Sorrel and a brief description of the plant.
- http://www.plant-identification.co.uk/skye/oxalidaceae/oxalis-acetosella.htm

Oxalis
- Information and range maps for all US species.
- http://plants.usda.gov/java/profile?symbol=OXALI

Oxalis (Yellow Wood Sorrel)
- Image and description of this weed.
- http://www.rce.rutgers.edu/weeds/weed.asp?oxalis

Oxalis pes-caprae
- Information and photos from Malta.
- http://www.marz-kreations.com/WildPlants/OXIL/Oxalis_pescarpes.html

Oxalis bowiei
-
- http://florawww.eeb.uconn.edu/acc_num/198502640.html

Oxalis martiana
- image
- http://www.botany.hawaii.edu/faculty/carr/images/oxa_mar.jpg

Oxalis lasiandra
-
- http://florawww.eeb.uconn.edu/acc_num/199100008.html

Oxalis gigantea
-
- http://florawww.eeb.uconn.edu/acc_num/198502645.html

Oxalis carnosa
-
- http://florawww.eeb.uconn.edu/acc_num/198502644.html

Oxalis corniculata
- image
- http://www.botany.hawaii.edu/faculty/carr/images/oxa_cor.jpg