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Family: dryopteridaceae
Common name(s): lowland fragile fern
Hardiness ratings: USDA zone 2~4 - 9 
General resources
Links for Cystopteris protrusa
- Carolina Nature - Photos of this native plant, often with notes on habitat and identification.
 (3 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 2-9)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (6 photos)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 2-9) (1 photo)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (2 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 2b-9a) (4 photos)
- Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (zone 4-9a) (1 photo)
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