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Posted on 3:22 AM by Wanto and filed under
By Lorenz Hills
The leaves of woody plants consist of the stalk or petiole and the lamina or blade. The petiole facilitates movement and positioning of the leaf. The blade is the part where photosynthesis, respiration and transpiration take place.
Simple leaves may differ in outline and may be linear - a narrow leaf with parallel sides, at least 12 times as long as it is wide; acicular- a narrow cylindrical leaf with a pointed tip, needle-like in form; lanceolate - basically, a leaf shaped like the head of a lance, with the broadest part below the middle and tapered to a point, but never less than 3 times as long as it is wide; ovate - similar to lanceolate, but always wider, and never more than twice as long as it is wide; egg-shaped; obovate - the reverse of ovate, the stalk rising from the narrow. end; orbicular - a rounded leaf as long as it is wide; cordate - heart-shaped, referring to the lobed base of leaves. rhomboid - diamond-shaped, or roughly so.
The amount of water transpired by trees into the atmosphere is very great and varies not only according to the size and species of the plants but also according to the conditions of the environment - soil moisture, relative humidity of the air, temperature, strength of the wind, etc.
When the leaflets are arranged laterally in pairs on the main leaf stalk, the leaf is termed pinnately compound.
Another essential element for the life of the tree is water and the dissolved minerals it contains. The tree absorbs the water from the soil through its roots, chiefly through the young parts. From the roots the water passes to minute tubes or vessels, through which it is transported to the trunk. In the trunk these tubes form a continuous column that carries the water to the branches at the very top of the tree. From there it travels via the petioles to the leaf blades where it is distributed by the veins to all parts of the leaf surface.
Only where insufficient rainfall, high temperatures or severe winters and frozen soil prevent the growth of trees do they leave such areas to grass, shrubs and succulents.
Simple leaves may differ in outline and may be linear - a narrow leaf with parallel sides, at least 12 times as long as it is wide; acicular- a narrow cylindrical leaf with a pointed tip, needle-like in form; lanceolate - basically, a leaf shaped like the head of a lance, with the broadest part below the middle and tapered to a point, but never less than 3 times as long as it is wide; ovate - similar to lanceolate, but always wider, and never more than twice as long as it is wide; egg-shaped; obovate - the reverse of ovate, the stalk rising from the narrow. end; orbicular - a rounded leaf as long as it is wide; cordate - heart-shaped, referring to the lobed base of leaves. rhomboid - diamond-shaped, or roughly so.
The amount of water transpired by trees into the atmosphere is very great and varies not only according to the size and species of the plants but also according to the conditions of the environment - soil moisture, relative humidity of the air, temperature, strength of the wind, etc.
When the leaflets are arranged laterally in pairs on the main leaf stalk, the leaf is termed pinnately compound.
Another essential element for the life of the tree is water and the dissolved minerals it contains. The tree absorbs the water from the soil through its roots, chiefly through the young parts. From the roots the water passes to minute tubes or vessels, through which it is transported to the trunk. In the trunk these tubes form a continuous column that carries the water to the branches at the very top of the tree. From there it travels via the petioles to the leaf blades where it is distributed by the veins to all parts of the leaf surface.
Only where insufficient rainfall, high temperatures or severe winters and frozen soil prevent the growth of trees do they leave such areas to grass, shrubs and succulents.
About the Author:
When a garden seems a part of the house visually, plan the garden so that its style match that of the inside.
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