. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 894 LAWSONIA LAYERING glabrous slirub, with branches spiny or not. Important generic characters are: calyx 4-parted: petals4: stamens 8: capsule i^^lobose, 4-celled, rupturing irregularly. Alba, Lara. Henna Plant. Lvs, opposite, oval-lanceo- late, entire, short-stalked : fls. panieled. Native to In- dia, the Or
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 894 LAWSONIA LAYERING glabrous slirub, with branches spiny or not. Important generic characters are: calyx 4-parted: petals4: stamens 8: capsule i^^lobose, 4-celled, rupturing irregularly. Alba, Lara. Henna Plant. Lvs, opposite, oval-lanceo- late, entire, short-stalked : fls. panieled. Native to In- dia, the Orient, N. Afr. Naturalized in West Indies. LAYERING. Figs. Layering is the pro- cess by which apart of a plant stem is made to produce roots while still attached to and nourished by the parent plant, so that it may be able to maintain an independent growth. The tendency, under favorable conditions, to produce roots from the cambium zone of some part of the stem is manifested by many plants, especially in the tropics. It may be noticed in the species of Ficus culti- vated in the greenhouse, inEpigJea and Wu(S Toxicoden- dron in the woods, in tomato vines in the garden, in grape canes lying on the ground, and frequently in youne^ apple trees when the trunk becomes covered with earth to an unusual depth. With most such plants, rooting by detached parts is easily accomplished, and this being more convenient,layering is generally practiced only with those plants which do not root readily from cuttings. The mode of root-production is essentially the same in either case. The right conditions as to moisture, temperature, food supply, etc., seem to stimulate the formation of one or more growing points in the cambium zone. The multiplying cells force their way through the bark, and if favorable soil contact is secured, supporting roots are soon developed. The same results may come, sometimes more readily, from or near a callus formed in the effort to heal a cut surface. It is
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