Invasive Plant Species Priority Lists

Malfurada and thoroughwort at Stinson Beach.

NPS / Eric Wrubel

The SFAN Invasive Plant Species Early Detection Program (ISED) creates lists of invasive plant species to target for early detection. The species are ranked from one (highest priority for early detection) to three (medium priority).

• Priority 1 plants are highly invasive and are typically not widespread. Control or even eradication is often feasible. ISED records point occurrences and polygon assessments for all patches of these species, regardless of their size. Point occurrences are individual points recorded to represent an entire patch of invasive plants. Polygon assessments describe the size, shape, and coverage of a patch.
• Priority 2 plants are highly invasive and usually more common than Priority 1 species. Small, outlier patches may be targeted for eradication or control. Uncommon species of concern are also listed here to improve our understanding of their distribution in the park. ISED records point occurrences for all patches, and buffered point assessments for patches smaller than 100 square meters.
• Priority 3 plants include all other non-native plants. These may be widespread invasives that are difficult to control at the scale of the park, or less common species that do not cause significant ecological harm. ISED records presence/absence by subwatershed. No points or polygons are mapped.

Priority Lists By Park

Each park's priority list is updated every year to stay current with park management goals. Download current and historical priority lists using the links below.

Golden Gate National Recreation Area

Source: Data Store Saved Search 3477 (results presented are a subset). To search for additional information, visit the Data Store.

John Muir National Historic Site

Source: Data Store Saved Search 3477 (results presented are a subset). To search for additional information, visit the Data Store.

Pinnacles National Park

Source: Data Store Saved Search 3477 (results presented are a subset). To search for additional information, visit the Data Store.

Point Reyes National Seashore

Source: Data Store Saved Search 3477 (results presented are a subset). To search for additional information, visit the Data Store.