. Introduction to botany. Botany. Adaptation to Environment. 325 side where they would become stopped up by the water, even in the case of the taller leaves in the time of high water. The upper surface of the leaf is coated with wax, so that the water which falls upon it rolls off with- out wetting it and stop- ping up the ways through the stomata. The inter- cellular spaces in the leaf are large and numerous and communicate with tubular spaces in the ribs of the leaf which are con- tinuous with still larger spaces in the petioles, horizontal stems, roots, and tubers. The sub- merged parts are
. Introduction to botany. Botany. Adaptation to Environment. 325 side where they would become stopped up by the water, even in the case of the taller leaves in the time of high water. The upper surface of the leaf is coated with wax, so that the water which falls upon it rolls off with- out wetting it and stop- ping up the ways through the stomata. The inter- cellular spaces in the leaf are large and numerous and communicate with tubular spaces in the ribs of the leaf which are con- tinuous with still larger spaces in the petioles, horizontal stems, roots, and tubers. The sub- merged parts are thus in free communication with the atmosphere. If we examine roots which have been carefully dug up, we find that they extend but a short dis- tance beneath the mud; indeed, the water-conduct- ing and absorbing ele- ments throughout the whole plant are very small compared with those found in xerophytes or even in mesophytes. Thus we see that where water can be had without stint, no special provision is made for its absorption, conduction,. Fig. 174. Ranunculus fluitans. The lower figure shows the land form and the upper figure the water form, % natural size. After 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 Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
