Wolffiella oblonga

Wolffiella oblonga, the saber bogmat, is a species of flowering plant in the subfamily Lemnoideae, the duckweeds. It is native to tropical and subtropical South America, and to a few locales in North America; Panama, Costa Rica, central Mexico, and the US states of California, Louisiana, and Florida. A tiny elongate hydroannual, it prefers quiet waters with moderate nutrient levels.