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be recognised as modern-day plant families. Some names he used, like Crataegus, Daucus and Asparagus have persisted until today. His second book Causes of Plants covers plant growth and reproduction (akin to modern physiology). Like Aristotle, he grouped plants into "trees", "undershrubs", "shrubs" and "herbs" but he also made several other important botanical distinctions and observations. He noted that plants could be annuals,

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