Northeast Wetland Flora
Field Office Guide to Plant Species
Isoetes engelmannii A. Braun
- Family: Quillwort (Isoetaceae)
- Spores: May-June
- Field Marks: This species is distinguished by its numerous leaves, sporangia. up to 1/2 inch long, and its honeycomb-marked megaspores.
- Habitat: Ponds, pools, shores, wet ditches.
- Habit: Perennial plant with a 2-lobed corm.
- Stems: Present as a 2-lobed corm.
- Leaves: Elongated, grass-like, 15 or more in number, up to nearly 1 1/2 feet long, smooth, swollen at the base to contain the sporangia.
- Sporangia: Male and female borne separately within the swollen, often paler, base of each leaf, up to 1/2 inch long.
- Spores: Female spores (megaspores) honeycomb-marked.
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