. Botany for high schools. Botany. ROOTS: KINDS OF ROOTS 29 which absorbs moisture from the air. Another example common in greenhouses is the wandering Jew (Tradescantia). The aerial roots grow from the joints, usually two roots from each joint. Good examples of aerial roots can be seen in the case of the climbing poison ivy, English ivy, trumpet creeper, etc. These serve to hold the vine to the tree or other support on which it is climbing. 49. Bracing roots, or prop roots.—In some plants where the fibrous-root system in the soil is not sufficient to support the heavy plant upright, aerial ro
. Botany for high schools. Botany. ROOTS: KINDS OF ROOTS 29 which absorbs moisture from the air. Another example common in greenhouses is the wandering Jew (Tradescantia). The aerial roots grow from the joints, usually two roots from each joint. Good examples of aerial roots can be seen in the case of the climbing poison ivy, English ivy, trumpet creeper, etc. These serve to hold the vine to the tree or other support on which it is climbing. 49. Bracing roots, or prop roots.—In some plants where the fibrous-root system in the soil is not sufficient to support the heavy plant upright, aerial roots are developed a short distance above the ground and as they reach the soil serv^e to prop or brace the plant. Good exam- ples are seen in the Indian corn, and in the screw pine grown so commonly in greenhouses. A classic example of prop roots is seen in the banyan tree of India where numerous roots grow downward from the wide spreading branches. The man- grove along the coast in the subtropical regions of Florida is another example. 50. Strangling roots.—In some tropical countries there are trees (Cliisia) which begin their life as seedlings on other trees from seeds which have lodged in the fork of a branch or some other landing place. Slender roots grow down to the ground, one of which forms this part of the trunk. Other roots coil around the foster tree. When the Clusia becomes a large tree these roots wrapped around the foster tree tighdy strangle and kill it.* 51. Fleshy roots, or root tubers.—There are roots or por- tions of roots which have become large and fleshy, as in the sweet potato or the dahlia. Such roots are reservoirs where plant food is stored to be used later by the plant for growth or * See ''A Tragedy of the Forest," Torreya 8, 253-259, Fig. 34. Bracing roots of Indian com. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illu
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