Vascular Plants of North Carolina
Account for Large-flower Water-primrose - Ludwigia grandiflora   (Michaux) Zardini
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Section 6 » Order Myrtales » Family Onagraceae
Author(Michaux) Zardini
DistributionCoastal Plain and lower Piedmont. Based on digital images, we cannot verify that all counties mapped are based on correctly identified specimens; for example Greenfield Lake in New Hanover County supposedly supports both L. grandiflora and L. hexapetala.

Native of South America (probably); in N.A. southern NY to FL and TX and MO; CA-OR-WA.
AbundanceRare to locally uncommon; easily confused with L. hexapetala, and some counties of these two may be unsettled as to identity.
HabitatLake shores, marshes, roadside ditches, railroad ditches, canals.
PhenologyFlowering and fruiting May-September.
IdentificationThis is one of the large-flowered water-primrose species. It is notable for the densely hirsute stems and branches. The leaves are variable, but generally are wider than those of L. bonariensis. To tell from its close relative L. hexapetala, see the key in Weakley (2018); however, L. grandiflora generally has smaller flowers -- about 1.5 inches across versus 2-2.5 inches across -- and leaves that are widest below the middle or at the middle versus widest toward the tip -- generally elliptical in shape as opposed to obovate (with a rounded tip in that species).
Taxonomic CommentsSynonyms include L. grandiflora var. grandiflora and ssp. grandiflora, and L. uruguayensis in part.

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