. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. 8 10 Fig. 5. Willow twig with tip transformed into a gall-cone through insect agency. 6. Willow twig after fall of leaves. 7. The same with axillary buds enlarged, in spring. 8. The same with axillary buds developed into (a) female flower-bearing branches, t;, scale (modified leaf) from one of the nodes of "; 9. Scale with its axillary bud developed into a flower, consisting of a pistil only, u, the stipe; 6, the ovary; c, the style; d, the stigmas. 10. Longutidinal sec
. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. 8 10 Fig. 5. Willow twig with tip transformed into a gall-cone through insect agency. 6. Willow twig after fall of leaves. 7. The same with axillary buds enlarged, in spring. 8. The same with axillary buds developed into (a) female flower-bearing branches, t;, scale (modified leaf) from one of the nodes of "; 9. Scale with its axillary bud developed into a flower, consisting of a pistil only, u, the stipe; 6, the ovary; c, the style; d, the stigmas. 10. Longutidinal section through willow pistil, a, placenta; 6, ovule. the center of a bud. A portion of the structures, having been originated before such injury, will reach a partial development, but further pro- duction is checked and a distorted product results. Bud-scales are Modified Leaves.—In the cases which we shall have to consider the modification dates from an earlier stage and is natural and physiological, instead of pathological, as in the case of the willow- cone. Fig. 6 represents a twig after the fall of its leaves in the autumn. Each bud is seen protected by its lowest leaf, permanently enlarged, and developed into a covering scale. At the base is seen the scar of the leaf in the axil of which the bud was developed. Fig. 7 illustrates the twig in the spring after early growth has enlarged the buds. The Flower Cluster is a Modified Branch.—In Fig. 8 (a) the covering scale has fallen, the branch has developed to a length of an inch or Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rusby, Henry Hurd, 1855-. Philadelphia and New York, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1911
