Persicaria maculosa (Polygonum persicaria)
USDA, NRCS. 2018. The PLANTS Database (http://plants.usda.gov, 28 March 2018). National Plant Data Team, Greensboro, NC 27401-4901 USA.
Illustration: USDA-NRCS PLANTS Database / USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.
What is Spotted Lady’s Thumb?
- 1.19-6 inches long
- 0.2-0.7 inches wide
- Dotted red
- Bulging on both sides
- Dark brown or black
- 0.08-0.11 inches long
- 0.75-3 feet tall
- Green or marked with red
- Swollen at nodes
- Rooting at nodes
Where Does it Grow?
Spotted lady’s thumb is non-native to North America and should not be promoted. This plant can be found in marshes, ponds, lakes and streams.
Pros and Cons of Spotted Lady’s Thumb
This plant is not native to North America, but has naturalized in much of the United States. While it is not illegal to possess this plant in Texas, it should not be introduced into new water bodies and should be treated with herbicide when present.