. Elementary botany. Botany. 400 KELATION TO ENVIRONMENT. ulus were entire!}- remo^'ed. As we know also contact or [)res- sure stimulus, or ; produces the same result in "sensitive" plants like mimosa, some species of rubus, etc. In many plants there is no well-developed pulvinus, and yet the leaves show similar movements in assuming the day and night positions. Examples are seen in the sunflower, and in the cotyledons of many plants. A little observation will enable any one interested to discover some of these plants.* In these cases the night position is due to epinastic gr
. Elementary botany. Botany. 400 KELATION TO ENVIRONMENT. ulus were entire!}- remo^'ed. As we know also contact or [)res- sure stimulus, or ; produces the same result in "sensitive" plants like mimosa, some species of rubus, etc. In many plants there is no well-developed pulvinus, and yet the leaves show similar movements in assuming the day and night positions. Examples are seen in the sunflower, and in the cotyledons of many plants. A little observation will enable any one interested to discover some of these plants.* In these cases the night position is due to epinastic growth, and while this influence is not removed during the day the light stimulus overcomes it and the leaf is raised to the day position. 770. Leaves which rotate with the sun.—During the growth period the leaves of the sunflower as well as the growing end. Fig. 430- Same sunflower plant photi;>graphed just at sundown. ot the stem respond readilv to the direct sunlight. The re- sponse is so complete that during sunny days the leaves toward the growing end of the stem are drawn close together in tlie form of a rosette aiid the entire rosette as well as the end of the * Seefllings are usually vcr)- sensitive In light ami are gnod objects to 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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