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Flowering plants are by far the most important plants and this book is
primarily a study of them. The most fundamental dividing line between
living organisms is that between prokaryote and eukaryote cells. Within
the eukaryotes there are three main multicellular kingdoms, plants,
animals and fungi, and a heterogeneous, mainly unicellular, kingdom
Protista. We include here only plants and some plant-like Protista.