British grasses and their employment in agriculture . y for an inch or two at the top. The shape of the young sheaths—and therefore of the youngshoot—is determined by the arrangement of the leaf-blades in theshoot (Figs. 6 and 7). If the blades are folded (conduplicate) thesheaths are more or less flattened or compressed, and usually thenhave acute edges or keels. If the blades are rolled (convolute) in Botanical Section [PT I the shoot, the sheaths are cylindrical and without strongly markedkeels. In the Oat and Couch-grass notice that the sheaths are split,and the leaves are rolled in the sh
British grasses and their employment in agriculture . y for an inch or two at the top. The shape of the young sheaths—and therefore of the youngshoot—is determined by the arrangement of the leaf-blades in theshoot (Figs. 6 and 7). If the blades are folded (conduplicate) thesheaths are more or less flattened or compressed, and usually thenhave acute edges or keels. If the blades are rolled (convolute) in Botanical Section [PT I the shoot, the sheaths are cylindrical and without strongly markedkeels. In the Oat and Couch-grass notice that the sheaths are split,and the leaves are rolled in the shoot. Soft Brome-grass (Bromusmollis, L.) is an example of a grass with entire sheaths, andCocks-foot (Daclylis glomerata, L.) shows the folding of the leavesin the young shoots very well indeed. Near the surface of the ground the sheaths of many grasses,either while quite young, or as they age, become characteristicallycoloured. The colour is constant for each species, and mayeither be present all round the sheath, or confined to the veins
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, booksubjectgr
