Fanwort Look Alikes Water marigold (Megalondonta beckii) Water Marigold Drawing, USDA, NRCS. 2004. The PLANTS Database, Version 3.5. Used with permission. Plant Characteristics Emergent leaves are lance-shaped with toothed margins Submersed leaves are finely divided and thread-like, attached directly to the plant's stem Produces yellow flowers July to September Can be found on lakeshores and in ponds and slow moving streams Back Page updated on August 15, 2005.