Vascular Plants of North Carolina
Account for Common Water-primrose - Ludwigia hexapetala   (Hooker & Arnott) Zardini & Peng
Members of Onagraceae:
Members of Ludwigia with account distribution info or public map:
Google Images
Section 6 » Family Onagraceae
Author(Hooker & Arnott) Zardini & Peng
DistributionCoastal Plain and Piedmont. Based on digital images, we cannot verify that all counties mapped are based on correctly identified specimens; for example, duplicate specimens from several counties have been determined as both L. grandiflora and L. hexapetala. That said, expert Elsa Zardini annotated most of the specimens we treat as L. hexapetala, but very few of those treated as L. grandiflora.

Native of South America; in N.A. NC to FL, TX, and OK; also CA.
AbundanceRare to uncommon, but can be quite abundant at a few places, such as Falls Lake in Wake/Durham/Granville counties.
HabitatLake shores and marshes, ditches, canals, creeks, fresh tidal marshes, farm ponds, swamps.
PhenologyFlowering and fruiting May-September.
IdentificationThis is a large-flowered water-primrose. It is notable for the sparsely (sometimes densely) hirsute stems and branches. Leaves are variable, but generally wider than those of bonariensis. To tell from its close relative L. grandiflora, see key in Weakley (2018). In general, this species has larger flowers -- to 2-2.5 inches across versus 1.5 inches across in L. grandiflora, and has leaves widest toward to the tip (versus widest below the middle in that species).
Taxonomic CommentsA synonym is L. uruguayensis in part; also L. grandiflora var. hexapetala. As mentioned above, there is still much to be settled regarding the distribution of these large-flowered exotic species.

Other Common Name(s)
State RankSE
Global Rank[GNR]
State Status
US Status
County Map - click on a county to view source of record.

View Mapping Selection Options
Select a source
Select an occurrence type