Students' handbook to accompany Plants and their uses . FK:. 22. Aerial roots (brace roots) of corn. Reduced Note that the <i and / ln^an ;is :n;rial routs, but later entered the ground :uil then many small lu-anrlies. Those at c. if not checked by frost, \\oiild eventually also have reached the ground EOOTS AND THEIR RELATION TO PLANTS 31. produce only water roots (if they have roots at all), is rathersmall. Some of the commonest are the so-called water hya-cinth and the little duckweeds (fig. 21). Plants like the pond weeds, water crowfoot, water weed(Eloded), and othe
Students' handbook to accompany Plants and their uses . FK:. 22. Aerial roots (brace roots) of corn. Reduced Note that the <i and / ln^an ;is :n;rial routs, but later entered the ground :uil then many small lu-anrlies. Those at c. if not checked by frost, \\oiild eventually also have reached the ground EOOTS AND THEIR RELATION TO PLANTS 31. produce only water roots (if they have roots at all), is rathersmall. Some of the commonest are the so-called water hya-cinth and the little duckweeds (fig. 21). Plants like the pond weeds, water crowfoot, water weed(Eloded), and others, which grow entirely submerged, do notneed an extensive root system, as they are in no danger ofdrying and so use their roots mainly for anchorage. 29. Air roots. Many plants which root in the earth, suchas corn, poison ivy, and English ivy, produce roots fromportions of the stem above-ground. These are called aerial roots. In some cases, as in corn (fig. 22) and in the mangrove tree, which grows along tropical coasts, the aerial roots finally reach the earth and serve as braces to prop the stem of the plant upright. In other instances the roots never reach the ground, and then they may serve to enable the plant to climb, as in the case of the poison ivy and the English ivy, or they may serve to anchor the plant to stones or to the bark of trees and at
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Keywords: ., bookcentury1900, bookcollection, bookdecade191, booksubjectbotany
