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Pelargonium acetosum, mid August. Sometimes known as Sorrel crane's bill or Sorrel-leaved pelargonium. Originally described in 1753 as Geranium acetosum by Carl Linnaeus, the name was changed to Pelargonium acetosum by the French botanist Charles Louis L'Héritier de Brutelle in 1789.<br />
It does not have attractively scented leaves. The epiphet  acetosum is Latin for 'sour' and refers to the acid taste of the leaves.