Oxalis

Sourgrass is a common name given to several plant species which have a sour taste. Most are in fact not grasses:

True grasses

• Digitaria insularis (sourgrass)
• Paspalum conjugatum (carabao grass)

Other

• Oxalis species (woodsorrels) of the Oxalidaceae, namely:
  • Oxalis corniculata (creeping woodsorrel)
  • Oxalis pes-caprae (Bermuda-buttercup)
  • Oxalis grandis (large yellow woodsorrel)
  • Oxalis montana (mountain woodsorrel)
  • Oxalis stricta (yellow woodsorrel)
• Rumex acetosella (sorrel) of the Polygonaceae