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Probably most non-botanical ramblers feel able to distinguish at once between the Dog-rose and the Field-rose, and a few may be learned enough to separate either or both from the Burnet-rose and the Sweet-briar&mdash;and they may do it. But the scientific botanist has difficulties, and he is not quite sure where one species leaves off and another begins. Many workers have so split up our six or seven British roses into a vast multitude of species, sub-species, and varieties that it is difficult to follow them. In this work we shall not attempt it. The Dog-rose is the largest of the British roses. It forms a bush of considerable size, with long arching branches, covered with broad hooks. The leaves are broken up into five leaflets, each of which is sharply toothed. The sepals are five in number, pinnate, and turned back towards the stem when the flower is open. The petals are five, pink and notched. Stamens many. Styles free, hairy. The ovary is sunk in the calyx, which changes to the pitcher-shaped scarlet fruits the "hips" of the schoolboy in which are the hairy achenes. Flowers mostly solitary. Generally common in hedges and copses, flowering from June to August.