Guide to the Vascular Flora of the Savannas and Flatwoods of Shaken Creek Preserve and Vicinity (Pender & Onslow Counties, North Carolina, U. S. A.) Thornhill, Robert Krings, Alexander Lindbo, David Stucky, Jon Biodiversity Data Journal 2014 2 1099 1099 Walter Magnoliopsida Onagraceae Ludwigia CoL Plantae Ludwigia linearis Myrtales 0 1099 Tracheophyta species linearis  Distribution Wet pine savannas (SPS-T, SPS-RF), borrow pits.  Notes Infrequent. Jun-Sep. Two varieties are recognized by Weakley (2012): var. Ludwigia linearis linearis, with the cells of the seed surface oriented parallel to the long axis of the seed, and var. Ludwigia linearis puberulaEngelm. & A. Gray, with the cells of the seed surface oriented irregularly or elongated perpendicularly to the long axis of the seed. This character, best seen at ≥ 20 xmagnification, is the only non-overlapping morphological character that distinguishes the two varieties. If varieties are recognized, the specimens collected by the senior author would be referable to var. Ludwigia linearis linearis. A specimen collected from Sandy Run [Hancock] (Taggart SARU 379, WNC) has been reported as var. Ludwigia linearis puberula( Taggart 2010). Thornhill 30, 941, 1117, 1203 (NCSC). [= RAB;> Ludwigia linearis Walter var. linearis, Ludwigia linearis Walter var. puberulaEngelm. & A. Gray sensu Weakley]