Trending: western sword fern (Polystichum munitum) — 53 observations this week
iNaturalist Community
Phenology
Surge in documented sightings helps scientists track where this iconic fern is thriving — or potentially struggling — which can signal broader changes in forest health in parks and wild areas near your home.
Thousands of everyday nature lovers use the iNaturalist app to photograph and identify plants, and this week western sword fern topped the charts with 53 confirmed sightings. This large, evergreen fern is a staple of forests along the Pacific Coast of North America, recognizable by its long, sword-shaped fronds. When lots of people are spotting and recording the same plant, it builds a valuable picture of where it's growing and how it's doing over time.
Key Findings
Western sword fern recorded 53 research-grade observations in a single week on iNaturalist, placing it among the most observed plant species.
All 53 observations met 'research-grade' status, meaning they were confirmed by multiple community identifiers — making the data scientifically usable.
The spike in observations reflects active community engagement during early spring, a peak period for fern visibility as deciduous understory competition is low.
chevron_right Technical Summary
Western sword fern is one of the most-observed plants on iNaturalist this week, with 53 research-grade sightings logged by citizen scientists. This Pacific Northwest native is capturing widespread attention from plant watchers across its range.
Abstract Preview
western sword fern is among the most observed plant species this week with 53 research-grade observations.
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Species Mentioned
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Polystichum munitum, the western swordfern, is an evergreen perennial fern native to western North America, where it is one of the most abundant ferns in forested areas. It occurs along the Pacific coast from southeastern Alaska to southern California, and also inland east to southeastern British...