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Surely, the reader says, we know a nettle when we see it, and certainly know it when we touch it, without needing description or figure. Perhaps so, but the average rambler, for whom this book is primarily intended, would certainly pass Campanula trachelium as a nettle if he encountered it before it flowered; and though he may know a nettle by being stung, he cannot in that simple manner determine the species, for there are three kinds occurring in England. We will, however, meet the objection so far that we will not waste many words in a general description, but deal more with the points of difference between the species. All have a liberal supply of the stinging hairs, and green flowers of two kinds. The staminate flowers consist of a four-parted perianth enclosing four stamens with kidney-shaped anthers. Pistillate flowers consist of a perianth and a single carpel, surmounted by a brush-like stigma. The name of the genus is from the Latin uro, to burn, in reference to the sensation produced by the stings.