Plant
Large-flowered clammyweed
Polanisia dodecandra ssp trachysperma
Habitat
Vermillion River
Conservation
Weedy
First Observed
1804-08-25
Closely related to Cleome. Sample for this included with specimen for it until recognized as separate species in 1898.
In the NPS atlas of species the expedition described
Large-flowered clammyweed
Discovered on the Vermillion River. This plant is closely related to the Cleome. Sample for this included with specimen for it until recognized as separate species in 1898.
Source: National Park Service, Lewis and Clark National Historic Trail Park Atlas.
Recent sightings
Where it’s being seen today
2 research-grade iNaturalist observations between 2015–2020. Most recent: 2020-10-21. Sourced from Terrain360 trail captures, cached locally.
