Northern Prairie Wildlife Research Center
Northeast Wetland Flora
Field Office Guide to Plant Species
Iodanthus pinnatifidus (Michx.) Steud.
- Family: Mustard (Cruciferae)
- Flowering: May-June
- Field Marks: This species is distinguished by its pinnatifid leaves with ear-like lobes at the
base of the leaf, its purple petals with slender basal claws, its slender, elongated, short-stalked
fruits, and its smooth leaves and stems.
- Habitat: Wet woods, along rivers.
- Habit: Perennial herb with slender roots.
- Stems: Upright, slender, branched above, smooth, up to 2 1/2 feet tall.
- Leaves: Basal leaves ovate to oblong, pinnatifid or coarsely toothed, smooth, to 8 inches long; stem leaves alternate, simple, ovate-oblong, pointed at the tip, tapering to the base, toothed or sometimes pinnatifid, up to 6 inches long, the winged leaf stalks with a pair of slender ear-like lobes at the base.
- Flowers: Numerous in panicles, each flower 1/4-1/2 inch wide, on slender, smooth, spreading stalks up to 1/4 inch long.
- Sepals: 4, free, green, in 2 pairs, the inner pair slightly swollen at the base, lanceolate, smooth, about 1/6 inch long.
- Petals: 4, free, purple, 1/4-1/2 inch long, with a slender claw at the base.
- Stamens: 6.
- Pistils: Ovary superior, smooth.
- Fruits: Elongated, slenderly cylindrical, slightly flattened, spreading or ascending, smooth, tipped by the persistent short style, up to 1 1/2 inches long, with several oblong seeds.
- Notes: This family is Brassicaceae according to Gleason and Cronquist.
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