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During the Eocene period about 50 million years ago, morphological structure and function of leaves is different from those of today's plants. At the time, the global climate was generally warm and humid. Tropical and subtropical vegetation flourished in most of the northern hemisphere. Subtropical vegetation grew and as far north as Greenland, although the planets poles were cool and mild. During the ear, there were no significant seasonal changes and snow and frost are virtually absent in large parts of the northern hemisphere.

Although, plants and animals are diversifying and expanding to today's modern species, archaic flora and fauna continue to thrive. Plant life was especially interesting and diverse.

In time, metabolic functions in archaic plants were probably more than in today's separate plants. Some leaves the segment, while others were continuous, depending on the need for water.

subtropical global climate was an integral part of archaic flora, because leaf growth requires much higher energy costs than the needs of today's flora. To offset the increased use of energy to produce leaves, absence temperate climate proved beneficial as possible archaic flora retain their leaves year-round.

The greater effort was necessary because many species of plants grown archaic layers thick hair, or through their leaves. They did so for several key reasons, most importantly to protect against the archaic fauna. Trichomes serve as a strong irritant to herbivores and large trunks of tropical and subtropical insects that inhabited the northern hemisphere this period and hunted plants.

In addition, trichomes serve to protect the leaves from the rare occurrence of frost and snow (although practically nonexistant, Extreme Cold occasionally occur) and from the hot dry weather. Both pose a serious threat to tropical and archaic subtropical foliage.

The requirement to spend more energy to produce foliage, the leaves are smaller and leaves the function was simplified in archaic flora. In additon the archaic flora had a greater need for water due to their tropical and subtropical natgure a reduced density storage of nutrients and water due to the smaller size of leaves. As a result, trichomes play a key role to reduce evaporation. The hair used to break up the airflow and evenly dispersed throughout the plant surface during windy weather, helping it retain moisture. They also helped trichomes of plants to absorb humidity, increasing their viability.

Significant quantities of photosynthesis (the conversion of radiant energy / solar radiation into chemical energy / glucose) not in the leaves, because the sunlight out wrapped in a thick layer of hair. Instead, the majority of photosynthesis occurred in the trichomes cover sheets. Consequently trichomes archaic flora were more complex than the modern flora, it consisted of chrloroplasts and played the most critical functions for the survival of plants.

It is likely that the archaic leaves only served three functions – Storage of water and chemical energy, and glucose transferred from trichomes, the conversion of chemical energy, and glucose into useable energy / food growth and metabolism and cellular respiration (Income carbon dioxide (CO2) and release oxygen (O)) with pore called stomata. The peaks covered with dense leaf stomata probably existed only on the underside of the sheet to further reduce evaporation and protects against possible fungal infections.

Evidence of simplified functions and morphological differences in leaf structure archaic products are present in leaf inclusions in amber specimens come + 50 million years found in Russia, Lithuania and other parts of the world. Layers of hair, despite the passage of time, retaining the green color of photosynthesis in some individuals. In addition, other specimens even show that some species of plants consisted of archaic segmented leaves, which could be better adapted than adjacent leaves to retain water, especially important feature as the potential for water loss from many tropical and subtropical archaic product poses a serious threat to their Well-being and even survival.

William Sutherland is a published poet and writer. He is the author of three books, “Poetry, Prayers & Haiku” (1999), “Russian Spring” (2003) and “Aaliyah Remembered: Her Life & The Person behind the Mystique” (2005) and has been published in poetry anthologies around the world. He has been featured in “Who’s Who in New Poets” (1996), “The International Who’s Who in Poetry” (2004), and is a member of the “International Poetry Hall of Fame.” He is also a contributor to Wikipedia, the number one online encyclopedia.

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