Read e-book online A Field Guide to Pacific States Wildflowers: Washington, PDF

By Theodore F. Niehaus

ISBN-10: 0395910951

ISBN-13: 9780395910955

Книга содержит описания и иллюстрации для 1492 видов из seventy seven семейств - фактически для всех дикорастущих цветов от Британской Колумбии до Калифорнии, от Скалистых гор до тихоокеанского побережья. Каждое видовое описание включает сведения по размерам, местообитаниям, распространению, периоду цветения, обычные и научные названия.
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Extra resources for A Field Guide to Pacific States Wildflowers: Washington, Oregon, California and Adjacent Areas

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Insect-­pollinated flowers, on the other hand, are usually very colorful and sweet smelling in order to attract the insects. Fertilization takes place when a male sex cell fuses with a female sex cell. For this to happen in a flowering plant, the male sex cell has to travel from the pollen grain right down into the ovary of the female part of the flower. 17 18 plants Insects pollinate flowers. These are monarch butterflies, which travel from flower to flower. S. Fish and Wildlife Service; photo by Allen Montgomery) Germination It is critical for a plant to scatter its seeds.

Earth’s climate then experienced many changes, causing the swamps to dry up and the tree ferns to die. The thick layers of dead tree ferns were eventually turned into thick beds of coal, which is the source of the coal that is mined and burned today. The Mesozoic era, which existed about 250 million to 65 million years ago, is divided into three periods: the Triassic, Jurassic, and Cretaceous. The plants and animals on Earth differed during each of these three periods. The changes in plant life during this era affected the development of animal life.

Bacteria that live in the soil convert organic forms of nitrogen to inorganic forms that plants can use. Plant roots then take up nitrogen. When the plant dies, it decays and becomes part of the organic matter in the soil. The land must be well managed, or nitrogen can be washed out of the soil, which then negatively impacts the growth of plants. renewable and nonrenewable resources The Oxygen Cycle The oxygen cycle follows the same paths as the carbon cycle because oxygen is part of carbon dioxide.

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A Field Guide to Pacific States Wildflowers: Washington, Oregon, California and Adjacent Areas by Theodore F. Niehaus

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