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The spiral-shaped fiddlehead of a sprouting fern is formed by the petiole, or leaf stalk, as it unfurls into a frond. As the leaf stalk grows, each pinna, or leaflet, at first appears as its own ...
The spiral-shaped fiddlehead of a sprouting fern is formed by the petiole, or leaf stalk, as it unfurls into a frond. As the leaf stalk grows, each pinna, or leaflet, at first appears as its own ...
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