Blooming white shamrock wood sorrel (oxalis acetosella) flowers in spring forest. Natural floral summer background. acetosella beautiful beauty bloom blossom botanical clover common edible flora flower foliage fresh garden grass green hare heart-shaped holiday ireland irish leaf leaves luck lucky nature oxalic acid oxalidaceae oxalis acetosella patrick plant season shamrock sorrel springtime summer symbol wild wildflower wood sorrel wood-sorrel