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Wiktionary
sourgrass

n. 1 sorrel 2 # of genus ''Oxalis''. 3 # of species (taxlink Rumex acetosella species noshow=1) 4 A species of crabgrass, (taxlink Digitaria insularis species noshow=1)

Wikipedia
Sourgrass

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

  • Digitaria insularis, a true grass ( Poaceae)
  • Oxalis species (woodsorrels) of the Oxalidaceae, namely:
    • Oxalis pes-caprae (Bermuda-buttercup)
    • Oxalis grandis (large yellow woodsorrel)
    • Oxalis montana (mountain woodsorrel)
    • Oxalis stricta (yellow woodsorrel)
  • Rumex acetosella (sorrel) of the Polygonaceae

Usage examples of "sourgrass".

I slowed at the top of Sourgrass Hill to look at the Crooks Farm produce stand.

Twice before, they've sat together at this same bar, two young men barely eighteen, putting away one mug of sourgrass ale after another.