. Botany; an elementary text for schools. Plants. 22 . PROPAGATION OF ROOTS AND STEMS their twigs, or the storms break them off: many of these twigs take root in the moist earth where willows grow, and they are often carried down the streams and are washed along the shoi-es of lakes. Observe the willows along a brook, and determine whether any of them may liave come down the stream. 58. PROPAGATION BY MEANS OF LEAVES.—Even leaves may take root and give rise to neiv plants. There are examples in warm countries. The lake-cress of northern streams also propagates in this way: the leaves with litt
. Botany; an elementary text for schools. Plants. 22 . PROPAGATION OF ROOTS AND STEMS their twigs, or the storms break them off: many of these twigs take root in the moist earth where willows grow, and they are often carried down the streams and are washed along the shoi-es of lakes. Observe the willows along a brook, and determine whether any of them may liave come down the stream. 58. PROPAGATION BY MEANS OF LEAVES.—Even leaves may take root and give rise to neiv plants. There are examples in warm countries. The lake-cress of northern streams also propagates in this way: the leaves with little plants attached may often be seen floating down stream. Gardeners propagate some kinds of begonias by means of leaf cuttings; also gloxinias and bryophyllums. 59. PROPAGATION BY MEANS OF BVDS.—Buds often become detached and j^ropagate the ])lant. Familiar examples are the bulblets of tiger lilies, borne amongst the foliage; for all bulblets and bulbs are only special kinds of buds. Fig. 30. Some water plants make heavy winter buds, which become detached on the approach of cold weather and sink to the bottom. In * spring, they give rise to new plants. 60. GRAFTS. — Sometimes a branch may 30. Buibiet of unite with another plant. A branch or a trunk may lie against another plant of the same kind, or of a very closely related kind, and grow fast to it; and if its original trunk die away, the part will be growing on an alien root. A branch which grotvs fast to a branch of another plant, the wood of the two knit- ting together, is called a graft. Fig. 31. It is necessary to distinguish between a graft and a parasite: a parasite prej's upon another plant, robbing it of its food, but a graft becomes an integral part of the stock on which it grows, and does its full work in elaborating food for itself and for the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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