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