. 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. 2484. Dahlia leaf, illustrating the branching of leaves. form galls on stem of goldenrod and asters is caused by the larva of a moth. In addition to true insects, the mites produce almost as great a variety of galls, pouch- galls and leaf-rolling being especially conspicuous. The cause of these deformities is s
. 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. 2484. Dahlia leaf, illustrating the branching of leaves. form galls on stem of goldenrod and asters is caused by the larva of a moth. In addition to true insects, the mites produce almost as great a variety of galls, pouch- galls and leaf-rolling being especially conspicuous. The cause of these deformities is sometimes the chemical stimulus produced by the of substances ("poisons ") at the time of egg-laying by the parent, in which case the gall develops around the egg; sometimes it is the mechanical stimulus due to movements of the. 2485. Toad-flax—Linaria. ShowinK normal and ab- normal flowers. Example of peloria. larva, together with the chemical stimulus from its va- rious excretions, in which case the gall develops after the hatching of the egg. 5. Brtincliing of leaves is not infrequent, and its cause is unknown. "Four-leaved" clovers offer well-known ex- amples, and the normal num- ber of leaflets is often in- creased to six or even more. Pig. 2-t8-l illustrates leaf- branching in the dahlia. Branching in the of flattening, both in foliage leaves and petals, has also been observed, and the branch described as an "out- ; 6. Peloria. When usually irregular flowers, such as those with some spurred or saccate petals or sepals, de- velop all the parts of each set alike, thus becoming radially symmetrical, the phenomenon is called pe- loria. It was first observed by Linnseus in Linaria vul- garis. , and the term peloria, derived from the Greek word for monster, was given by him. Flowers often become peloric on ac- count of changes in their re- lations to light, but other causes certainly cooperate. A reverse change, by
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