. Bulletin of the Botanical Department, Botany, Economic; Jamaica; Periodicals.; Plants; Jamaica; Periodicals.; Agriculture; Jamaica; 225 Tendrils exhibit irritability of the most highly developed form and react to a number of stimuli by very rapid movements. When a tendril comes into contact with a branch of a tree or another solid body, it will begin to curve in a time vaying from five seconds to an hour, and soon completely encircles the body with which it has come into contact. In this manner the apical growing portions of a vine are fastened to a support. As soon a
. Bulletin of the Botanical Department, Botany, Economic; Jamaica; Periodicals.; Plants; Jamaica; Periodicals.; Agriculture; Jamaica; 225 Tendrils exhibit irritability of the most highly developed form and react to a number of stimuli by very rapid movements. When a tendril comes into contact with a branch of a tree or another solid body, it will begin to curve in a time vaying from five seconds to an hour, and soon completely encircles the body with which it has come into contact. In this manner the apical growing portions of a vine are fastened to a support. As soon as this has been accomplished the part of the tendril between the plant and the object to which it is attached exhibits another movement by which it is thrown into the form of a spiral spring, which pulls the plant upward through a distance equal to about one third the length of the tendi il. The tendril wall also move in response to a number of other stimuli, such as heat, acids, electric cur- rents, and may be rendered incapable of motion by ether or chloroform. A movement which has for its purpose the facilitation of reproduction is offered by the Water Hyacinth (Eichhornia speciosa) which is to be found in the botanic gardens of Jamaica. The perfection and germination of the seed of this aquatic plant can take place under water only. If an examination of the plant is made during the proper season it will be seen that the showy azure flowers stand upon erect flower st dks several inches above the water. Soon after the pollen has been conveyei from the stamens to the pistils the flower stalk beg ns to bend downward. 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 Fawcett, William, 1851-1926; Jamaica. Botanical Department; Jamaica. Department of Public Gardens and Plantations. Kingston, Botanical Dept.
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