Sourgrass

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