Northern Prairie Wildlife Research Center
Disk Water Hyssop (Bacopa rotundifolia)
- Family: Figwort (Scrophulariaceae)
- Flowering: May-September.
- Field Marks: This species, with small bluish flowers, has spherical, toothless leaves.
- Habitat: Around ponds and lakes, along streams, low woods.
- Habit: Perennial herb with creeping stolons.
- Stems: Creeping or floating if in water, branched or unbranched, usually hairy, up to 2 feet long.
- Leaves: Opposite, simple, spherical to obovate, rounded at the tip and at the base, sometimes clasping at the base, usually without teeth, smooth, up to 1 inch long and broad.
- Flowers: Blue, 1 or 2 in the axils of the leaves, up to 1/3 inch long.
- Sepals: 5, green, united below, asymmetrical.
- Petals: 5, bluish, united, 2-lipped, up to 1/3 inch long.
- Stamens: 4, shorter than the petals.
- Pistils: Ovary superior.
- Fruits: Capsules oblongoid, rounded at the tip, up to 1/4 inch long.
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