Northern Prairie Wildlife Research Center
Creeping Yellow-cress (Rorippa sylvestris)
- Family: Mustard (Brassicaceae)
- Flowering: May-September.
- Field Marks: All species of Rorippa have small yellow flowers with 4 petals. Rorippa sylvestris differs from all the others by having the petals longer than the sepals and by having all leaves deeply pinnately divided.
- Habitat: Wet meadows, along streams.
- Habit: Perennial herb with creeping rhizomes.
- Stems: Erect, branched or unbranched, smooth or slightly hairy, up to 8 inches tall.
- Leaves: Alternate and basal, all deeply pinnately divided, the lowest up to 6 inches long, the upper ones much smaller, smooth or slightly hairy.
- Flowers: Yellow, borne in racemes, up to 1/6 inch broad.
- Sepals: 4, green.
- Petals: 4, yellow, free from each other, longer than the sepals.
- Stamens: 6, not all the same length.
- Pistils: Ovary superior.
- Fruits: Slender, more or less straight, up to 3/4 inch long, with a very short beak.
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