#sword_fern__swordfern  any of several tropical ferns having more or less sword-shaped fronds including one from which the Boston fern developed
  supertype:  fern  any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
  member of:  genus_Nephrolepis
  subtype:  Boston_fern__Nephrolepis_exaltata__Nephrolepis_exaltata_bostoniensis  a sword fern with arching or drooping pinnate fronds; a popular houseplant
  subtype:  basket_fern__toothed_sword_fern__toothedswordfern__Nephrolepis_pectinata  tropical American fern cultivated for its finely divided grayish-green foliage; West Indies and southern Mexico to Peru and Brazil

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