| Author | (L.) Rafinesque | |
| Distribution | Throughout the southern half of the Coastal Plain, but scattered in the northern portion; a disjunct record into the southern Piedmont (Union County).
This is a mainly Coastal Plain species, extending from Long Island, NY to southern FL and west to eastern TX.
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| Abundance | Infrequent and easily overlooked, in the Coastal Plain north to Moore, Johnston and Carteret counties; rare to locally uncommon north to the VA border. Extremely rare in the southern Piedmont. It is much more numerous than the NCNHP's S2S3, and the website editors recommend S3. | |
| Habitat | This is a wetland species of many habitats. It occurs in ditches, shores of pools and ponds, especially in muddy drawdowns, and other damp ground. | |
| Phenology | Blooms from August to October, and fruits shortly after flowering. | |
| Identification | This is a very easily overlooked species, even when in bloom, as it grows well under a foot tall. It has a slender stem to about 10 inches tall, often leaning, with scattered opposite stem leaves. Each leaf is elliptical, about 2/3-inch long and about 1/3 as wide; the leaves and the stem are quite hairy/hispid. The flowers are mostly single in axils, or terminal on the stem, bell-shaped, but the 4 white petals have a spread of barely 1/6-inch across. Oldenlandia boscii is similar but has much narrower, linear leaves, about 1/10-inch wide, much longer than wide. Though hardly a scarce species, many biologists are not familiar with it, as it certainly does not draw attention by large or colorful flowers. | |
| Taxonomic Comments | This species was long placed in the genus Oldenlandia, as O. uniflora; some references still retain it there.
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| Other Common Name(s) | Oldenlandia, Clustered Mille-graines | |
| State Rank | S2S3 [S3] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
