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John Ray (1628 - 1705) - an emminent English naturalist who worked on classification of organisms and was the first to divide flowering plants into monocotyledons and dicotyledons. He also recognised fossils as the remains of once living organisms.
Joint - a pont where a side-shoot or leaf grows out of a stem. A single section or segment of a stem composed of a series of units.
Juvenile - young or immature, not having flowered.
Juvenile leaves - the first set of leaves, especially when differing from the mature leaves.