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perennial plant, deciduous in winter. The large, roughly triangular fronds are produced singly, arising upwards from an underground rhizome, and grow to 0.3-1 m tall; the main stem, or stipe, is up to 1 cm in diameter at the base. It dies back to ground level in autumn. The rhizome grows up to 3.5 m deep, about 5 cm in diameter, and up to 15 m long. Because it regrows in the spring from an underground rhizome,

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