Lobelia dortmanna (Water Lobelia)
|Also known as:|
|Habitat:||sun; lake edges, shallow water|
|Bloom season:||July - September|
|Plant height:||10 to 40 inches|
|Wetland Indicator Status:||GP: none MW: OBL NCNE: OBL|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Loose raceme on the emergent portion of a hollow stem, rising up to 12 inches above the water surface. Flowers are pale blue to white, ½ to ¾ inch long, the petals forming a long tube with 3 lower lobes of similar size and 2 smaller upper lobes. The lower lobes are hairy at the base. 5 short lance-like sepals surround the base of the tube, set upon a short stalk.
Leaves and stems:
A decidedly northern species, Lobelia dortmanna is relatively common in the cool, clear tanin-stained lakes of the Arrowhead region. While only the emergent 10-12 inches is visible, the hollow, underwater portion of the flower stalk can be up to 3 feet long! Flowers can even bloom and set seed under water. When not in bloom, the hollow, blunt-tipped leaves distinguish Water Lobelia from other aquatic species.
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Where to buy native seed and plants ↓
- Water Lobelia plant
- Water Lobelia habitat
- Water Lobelia with Pipewort (Eriocaulon aquaticum)
- submersed leaves
- submersed plants
Photos by K. Chayka taken at Toohey Lake, Cook County. Photos courtesy Peter M. Dziuk taken at Toohey Lake and at Divide Lake, Lake County.
Have you seen this plant in Minnesota, or have any other comments about it?