British grasses and their employment in agriculture . Fig. 6 Fig. 7 Fig. 6. Transverse section of young shoot of Poa trivialis x 20, showing the oonduplicate (folded) arrangement of the leaf-blades Bl^, Bl2 etc. Sh. the outer entire sheath (shaded). K. Keel of 7. Transverse section of young shoot of Phleum pratense x 20, showing convolute (rolled) arrangement of the leaf-blades BIX, Bl2 etc. Sb. the split sheath. Leaf-blades. These are attached to the upper part of thesheaths and may be either expanded or closed, the blademay remain almost flat, or the two sides of its upper s
British grasses and their employment in agriculture . Fig. 6 Fig. 7 Fig. 6. Transverse section of young shoot of Poa trivialis x 20, showing the oonduplicate (folded) arrangement of the leaf-blades Bl^, Bl2 etc. Sh. the outer entire sheath (shaded). K. Keel of 7. Transverse section of young shoot of Phleum pratense x 20, showing convolute (rolled) arrangement of the leaf-blades BIX, Bl2 etc. Sb. the split sheath. Leaf-blades. These are attached to the upper part of thesheaths and may be either expanded or closed, the blademay remain almost flat, or the two sides of its upper surface maybe folded one upon the other; or again the blade may be rolledup like a roll of paper. This rolling or folding of the blademay be only temporary and due to drought or exposure, butin some species, Sheeps Fescue, this type of leaf is normaland permanent. In order to understand more clearly this processof rolling up and unrolling, etc., and to realise its great signifi-cance, it is necessary to consider briefly the internal structureof
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, booksubjectgr
