| Author | Lamarck | |
| Distribution | Mostly in the Piedmont and Sandhills; also in Alleghany County in the Mountains and Pitt County in the Coastal Plain. First collected in 1946 in Cabarrus County, 1950 in Durham County, and 1953 in Polk County.
Native of Africa and Asia; in N.A. NJ to IN and AR, south to FL and TX. Also CA. | |
| Abundance | Apparently rare, but could be passed by as one of the native Hydrocotyle species -- but its very small leaves are a give-away. | |
| Habitat | Mesic to moist soil -- lawn weed, weed in campus planters, yard weed, edges of rivers, weed in gravel driveway, weed in gravel parking lot. | |
| Phenology | Flowering and fruiting March-September. | |
| Identification | Lawn Marsh-pennywort tends to form prostrate mats, which may grow to a foot or more in diameter. The leaves are the smallest of any of our pennyworts -- rather orbicular in shape with strongly scalloped margins and a deeply cordate base. The flowers are tiny, yellowish, in tight umbels atop stems 3 mm long. | |
| Taxonomic Comments | | |
| Other Common Name(s) | | |
| State Rank | SE | |
| Global Rank | GNR | |
| State Status | | |
| US Status | | |
| USACE-agcp | FACW link |
| USACE-emp | FACW link |
