. Nature and development of plants. Botany. Fig. 13. Fig. 14. Fig. 13. Branch of Forsythia, leaves decussate, in four rows. Fig. 14. Branch of poplar with leaves spirally arranged in five rows. receives light. This becomes very noticeable if we look directly down upon a shoot or better if we stand under a tree and look up into the branches. It will be seen that very little direct sun- light finds its way through the branch, so nicely are the leaves adjusted to each other. Some plants like the hickories, catalpa, etc., occupy all the available space with a few large leaves at the tips of the br
. Nature and development of plants. Botany. Fig. 13. Fig. 14. Fig. 13. Branch of Forsythia, leaves decussate, in four rows. Fig. 14. Branch of poplar with leaves spirally arranged in five rows. receives light. This becomes very noticeable if we look directly down upon a shoot or better if we stand under a tree and look up into the branches. It will be seen that very little direct sun- light finds its way through the branch, so nicely are the leaves adjusted to each other. Some plants like the hickories, catalpa, etc., occupy all the available space with a few large leaves at the tips of the branches. In other cases, as in the willows, some lilies, etc., the same result is accomplished by many small leaves that can be arranged along the stem for considerable distances without shading. The nicety of leaf arrangements is especially noticeable in many horizontal and creeping stems. In such cases the leaves can only be exposed on the sides of the stem and con- sequently the stem may become twisted or more usually 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 illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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