- Floridata: Iris pseudacorus
- Provides information on the distinguishing characteristics, culture, location and usage. With photos.
- Global Invasive Species Database: Iris pseudacorus (herb)
- Contains information on the features of the plant. Includes habitat, general impact, range, nutrition and reproduction.
- Homestead.org: Iris pseudacorus
- Presents information on the history and propagation. Includes other issues and photos.
- Non-Native Invasive Aquatic Plants in the United States: Iris pseudacorus
- contains data on the identification of the plant. Includes habitat, distribution, history, problems and photos.
- Plant Identification: Yellow Flag-Iris pseudacorus
- Presents basic information on the plant. With photos.
- Plants for a future: Iris pseudacorus - Yellow Flag
- Contains data on the physical characteristics, habitat, medical and edible uses. With photos.
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