Family:
Marsileaceae
Toxins:
thiaminase
Flower Color:
  • flower color
Found:
waterside, wetlands, roadsides, wasteareas

Time of Greatest Risk

JFMAMJJASOND

Geographical Distribution

Nardoo distribution - United States

Nardoo

Marsilea drummondii

7/ 10
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.

Toxic components
All parts of M. drummondii contain very high amounts of thiaminase during the early stages of their growth. Thiaminase is the same toxin that is found in bracken fern (Pteridium aquilinum), which results in bracken fern toxicity. Horses are most at risk of poisoning from consumption of M. drummondii following a flood or heavy rain.