Nardoo (Marsilea drummondii) is a perennial fern that grows quickly in water and mud found along areas with poor drainage and edges of inland lakes, roadside drains, rivers, or other water sources following a flooding. M. drummondii resembles a four-leaf clover, and produces spores which germinate in response to moist environments.
All parts of M. drummondii contain very high amounts of thiaminase during the early stages of their growth. Poultry are most at risk of poisoning from consumption of M. drummondii following a flood or heavy rain.
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