. Notes on the life history of British flowering plants. Botany; Plant ecology. 28 BRITISH FLOWERING PLANTS hand, equally necessary that it should not be too rapid, for in severe weather the frost often checks the supply of water by the roots, even though they go to a con- siderable depth. The same safeguards against too rapid evaporation render them suitable to hot dry regions. The leatheri- ness of the leaves is also, no doubt, a protection against browsing quadrupeds, as also are the aromatic properties of many such species. Besides the Heaths, Azalea, Empetrum (Fig. 11), Silene acaulis, an
. Notes on the life history of British flowering plants. Botany; Plant ecology. 28 BRITISH FLOWERING PLANTS hand, equally necessary that it should not be too rapid, for in severe weather the frost often checks the supply of water by the roots, even though they go to a con- siderable depth. The same safeguards against too rapid evaporation render them suitable to hot dry regions. The leatheri- ness of the leaves is also, no doubt, a protection against browsing quadrupeds, as also are the aromatic properties of many such species. Besides the Heaths, Azalea, Empetrum (Fig. 11), Silene acaulis, and some Saxi- frages belong to this type. Another northern type is that represented by. Fio. 11.âTransverse section of leaf of Empetrum. u;, upper face; 5, under face ; «â , stoma, shown closed by the approximation of the guard-cells. Cerastimn alpinwn. The tapering form carries off the moisture, which, moreover, is kept from the stomata by matted woolly hairs. The result is that as soon as the sun comes out transpiration becomes possible. On the other hand, they are less suitable where there is much snow. Other leaves of the same type are Salix lanata and S. repens (two of the Arctic Willows), Gnaplialium sivpinum (Arctic or Dwarf Cudweed), Bartsia alpina, the Mountain Forget-me-not (Myosotis silvatica), Cotoneaster vulgaris, and Hieracium Pilosella, one of our commonest Hawkweeds. Another type may be called " snow ; Of this group Viola palustris is an example. The leaves seem. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lubbock, John, Sir, 1834-1913. London, New York, Macmillan and Co. , Ltd.
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Keywords: ., bookauthorlub, bookcentury1900, bookdecade1900, booksubjectbotany
