Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Lycopus uniflorus Michx.
- Family: Mint (Labiatae)
- Flowering: July-September
- Field Marks: All species of Lycopus have tiny white flowers crowded in the axils of the opposite leaves. This one differs from others in the genus by its triangular sepals, white tubers, and nearly smooth stems. The leaves are coarsely to
- Habitat: Wet ground in woods, along streams, in meadows, bogs, marshes, around springs.
- Habit: Perennial herb with stolons bearing white tubers.
- Stems: Upright, square, branched or unbranched, usually smooth, up to 2 feet tall; stolons forming white tubers.
- Leaves: Opposite, simple, lanceolate to oblong-lanceolate, up to 2 1/2 inches long, pointed at the tip, tapering to the base, smooth, coarsely toothed.
- Flowers: Several crowded in dense clusters in the axils of the leaves, the clusters at maturity up to 1/2 inch in diameter.
- Sepals: 4 or 5, green, united below, the lobes triangular, smooth, rounded at the tip.
- Petals: 5, unequal, united below, white, up to 1/8 inch long.
- Stamens: 2, usually exserted beyond the petals.
- Pistils: Ovary superior, 4-parted.
- Fruits: Nutlets 4, brownish, about 1/20 inch long.
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