Perennial herb to 60 cm tall Leaves: alternate, stalked, not clasping, 3 - 10 cm long, reverse lance-shaped, bases lobed, tips rounded, slightly toothed to toothed. Flowers: in branched clusters (racemes). Sepals ascending. Petals four, yellow, slightly longer than sepals, bases narrowed. Stamens six. Fruit: a short pod, long-stalked, 1 - 2 mm long, about as long as wide, shorter than stalks, rounded. Seeds often not maturing. Roots: creeping, thick, fleshy.
Similar species: No information at this time.
Habitat and ecology: Introduced from Europe. In the Chicago Region, this field weed is known only from Walworth County, Wisconsin, where it was collected in 1968 from a large roadside colony.
Occurence in the Chicago region: non-native
Etymology: Rorippa possibly comes from the Latin roro, meaning "to be moist," and ripa, meaning riverbank. Austriaca means Austrian.
Perennial to 6 dm, from rather thick and fleshy creeping roots; lvs oblanceolate, 3-10 cm, mostly obtuse, dentate to subentire, gradually tapering to an auriculate base; pet slightly longer than the sep; mature pedicels ascending, 7-15 mm; frs globose, 1-2 mm, about as long as wide, the replum circular in outline, often not maturing seeds; style about as long as the fr; 2n=16. Native of Europe, sparingly established as a weed in fields here and there in our range. June, July.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.