| Family | Onagraceae |
| Scientific name | Ludwigia sp. |
| Common name (English) | Water Primrose |
| Common name (Malay) | / |
| Identified as | Pioneer plant on Project M.A.R.S.’s land |
Ludwigia spp., commonly known as water primrose, refers to a diverse group of aquatic and semi-aquatic plants in the Onagraceae family. These species are typically found along riverbanks, wetlands, ponds, and other moist habitats across tropical and subtropical regions. Characterized by their bright yellow flowers and sprawling or upright growth forms, Ludwigia species play an important ecological role in wetland environments by providing habitat and stabilizing soil. Some species are also used in traditional medicine for their purported anti-inflammatory and antimicrobial properties. With their ecological significance and widespread distribution, Ludwigia spp. remain important components of freshwater ecosystems.