Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Isoetes lacustris L.
- Family: Quillwort (Isoetaceae)
- Field Marks: This quillwort is almost always found submersed in water. It has extremely long leaves, as much as 8 inches long.
- Spores: May-June
- Habitat: Lakes in the mountains.
- Habit: Submersed perennial plant with a 2-lobed corm.
- Stems: Underwater as a 2-lobed corm.
- Leaves: Elongated, grass-like, up to 30 in number, dark green, up to 8 inches long, swollen at the base to contain the sporangia.
- Sporangia: Borne within the swollen, paler base of each leaf.
- Spores: Cream-colored with minute spines (when viewed through a microscope).
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(Marsilea uestita )