A low spreading plant with yellow flowers and clover-like leaves, Oxalis stricta.

(cooking) Between sweet and sour taste. / Having both positive and negative traits, or inspiring conflicting good and bad feelings.

Nyssa sylvatica (black tupelo) / Nyssa aquatica (water tupelo)

natural gas, or any other gas, containing significant amounts of hydrogen sulfide

(idiomatic) Indigestion.

plural of sour stomach

plural of sour gum

(slang) A particular cannabis hybrid with a pungent aroma reminiscent of diesel.

plural of sour note

plural of sour krout