A Photographic Guide to Wild Flowers of South Africa - download pdf or read online

By Braam Van Wyk

ISBN-10: 1868723909

ISBN-13: 9781868723904

Включая 265 наиболее обычных южноафриканских дикорастущих вида, книга фокусируется на цветах, которых можно часто встретить вдоль дорог, на открытых пространствах, в национальных парках и на популярных прогулочных маршрутах. Книга дополнена исторической, медицинской и культурной информацией о характеризуемых цветах.
Доп. информация: Файл является рипом с сайта Google Books. Этим определяется отсутствие некоторых страниц (до 20% от общего числа) и невысокое разрешение сканирования (около a hundred dpi).

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Now, with no shortage of seed dispersal agents and a complete absence of seed predators, there is an olive population explosion and soon everywhere on Fuerteventura that an olive tree can grow has been colonized by a descendant of the first olives to arrive. So great is the fecundity of most plants and the power of geometric increase that a scenario such as we have imagined could be completed within just a few generations of the first seeds arriving. And, once complete, with every spot that an olive can grow already occupied, the next dead pigeon flock to wash up on the island would deposit a seed load with no future.

Imagine the scene. One day, millions of years ago, a small flock of Moroccan pigeons that has been feeding on olives and is carrying some olive stones is blown off course by a gale and lands, exhausted, on Fuerteventura. There is little or no vegetation on the is-    land and the pigeons soon die in such inhospitable surroundings. The storm abates, but the rain that has fallen is still cascading in sheets down the naked, rocky mountainside into the sea and the torrent seizes the pigeons’ carcasses and carries them away—but not all of them, as some lodge fast in rock crevices.

The anatomical feature that separates the two major limbs is not in their leaves but in the microscopic structure of their pollen. Eudicot pollen grains have three apertures, whereas those of the monocots and broadleaves on the other limb all have a single, grooved aperture. This latter type of pollen seems to be the ancestral one, from which the eudicots evolved their three-apertured type. Whether the evolution of a novel kind of pollen itself gave the eudicots a major advantage, or whether it is merely a fortuitous indicator of something else of importance, is a mystery.

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A Photographic Guide to Wild Flowers of South Africa by Braam Van Wyk


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