The identity of an invasive plant newly spotted in the iNaturalist Invasives ArMI project was recently confirmed by an iNaturalist identifier as being narrowleaf bittercress (Cardamine impatiens). Observation: https://www.inaturalist.org/observations/114187428
As a single plant, it is unassumingly frilly and not too large, but its seeds eject from garlic mustard-style skinny seed pods to establish large colonies very quickly. Like garlic mustard, it is in the mustard family.
The above specimen was observed at the Arlington Reservoir, in its preferred habitat around watercourses (streams, ditches, floodplains). Viewing iNat's collection of photos (https://www.inaturalist.org/taxa/159836-Cardamine-impatiens/browse_photos ) will help familiarize you with how it looks at all different times of year.
Thank you for this observation at the Arlington Reservoir near the native gardens. Now we all can be on the look out, especially around waterways.
Read More from the Lower Hudson Partnership for Regional Invasive Species Management (LHPRISM), which rates this plant as highly invasive in NY. ( https://www.lhprism.org/species/cardamine-impatiens )
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