| Onocleaceae | Matteuccia struthiopteris var. pensylvanica | Ostrich Fern | Alluvial forests and calcareous wetlands; sometimes grown as a woodland garden (shade) ornamental. | The species is circumboreal; the North American var. pensylvanica ranges from NL (Newfoundland) west to AK, south to VA (Smyth and Craig counties), n. MO, SD, and BC. | 
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| Onocleaceae | Onoclea sensibilis | Sensitive Fern, Bead Fern | Marshes, swamps, bottomland forests, ditches, wet disturbed places. | NL (Newfoundland) west to MN and CO, south to FL and TX. O. interrupta of e. Asia is sometimes treated as a variety or included in O. sensibilis without taxonomic recognition (see synonymy). | 
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