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Lesions on Cherry leaves (Wikimedia Commons).

As a general rule, leaves are flattened, above-ground organs specialized for photosynthesis. There are tremendous variations of leaf shape and size, with numerous adaptations, many of which make you wonder if what you're looking at is really a leaf.

Learn about what conifer needles, onion bulb layers and and succulent leaves have in common on this week's episode of Nature Notes.

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