. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. MODE OF LIFE IX ANNUALS AND BIENNIALS. Z/ height of a man. And if they reach this size, it is not as a single main trunk, but bj a cluster of stems all starting from the ground. G6. Trees are woody phmts rising by a trunk to a greater height than shrubs. 67. Herbs are divided, according to their character and duration, into Annuals, Biennials, and Perennials. 68. Annuals grow from t
. Botany for young people and common schools. How plants grow, a simple introduction to structural botany. With a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany. MODE OF LIFE IX ANNUALS AND BIENNIALS. Z/ height of a man. And if they reach this size, it is not as a single main trunk, but bj a cluster of stems all starting from the ground. G6. Trees are woody phmts rising by a trunk to a greater height than shrubs. 67. Herbs are divided, according to their character and duration, into Annuals, Biennials, and Perennials. 68. Annuals grow from the seed, blossom, and die all in the same season. In this climate they generally spring from the seed in spring, and die in the autumn, or sooner if they have done blossoming and have ripened their seed. Oats, Barley, Mustard, and the common Morning-Glory (Fig. 4) are famiHar annuals. Plants of this kind have jihrous roots, i. e. composed of long and slender threads or fibres. Either the whole root is a cluster of such fibres, as in Indian Corn (Fig. 48), Barley (Fig. 5G), and all such plants; or when there is a main or tap root, as in Mustard, the Morning-Glory, &c., this branches off into slen- der fibres. It is these fibres, and the slender root-hairs which are found on them, that mainly absorb moisture and other things from the soil; and the more numerous they are, the more the plant can absorb by its roots. As fast as nourishment is received and pre- pared by the roots and leaves, it is expended in new growth, par- ticularly in new stems or branches and new leaves, and finally in flowers, fruit, and seed. The latter require a great deal of nour- ishment to bring them to perfection, and give notliing back to the plant in return. So blossoming and fruiting weaken the plant very much. Annual plants usually continue to bear flowers, often in great numbers, upon every branch, until they exhaust themselves and die, but not until they have ripened seeds, and stored up in them
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