Northern Prairie Wildlife Research Center
Waterparsnip (Sium suave)
- Family: Carrot (Apiaceae)
- Flowering: July-September.
- Field Marks: This robust perennial is distinguished by its umbels of white flowers and its once-pinnate leaves with toothed leaflets.
- Habitat: Wet woods, swamps, wet roadside ditches, wet prairies.
- Habit: Perennial herb with fibrous roots.
- Stems: Erect, branched, angular, smooth, hollow, up to 8 feet tall.
- Leaves: Alternate, pinnately divided into 11-15 leaflets; the leaflets lanceolate, pointed at the tip, tapering to the base, toothed, smooth, up to 5 inches long, up to 2 inches broad; leaves under water divided into thread-like or linear segments.
- Flowers: Many in a compound umbel; each flower white, up to 2/3 inch across.
- Sepals: 5, green, very tiny.
- Petals: 5, white, free from each other, up to 1/3 inch long.
- Stamens: 5.
- Pistils: Ovary inferior, smooth.
- Fruits: Ellipsoid, with several strong vertical ribs, 1/6 inch long.
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