Rorippa amphibia (L.) Besser
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Brassicaceae
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Scientific Name
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Description
Species Description - Erect or ascending perennial to 1 dm; stems hollow, often rooting below; lvs lanceolate to oblanceolate, to 12 cm, the lower or submersed ones commonly laciniate to pectinately parted, the upper narrower and merely dentate; pet about twice as long as the sep; mature pedicels 8–15 mm, horizontally spreading or somewhat deflexed; frs ellipsoid, straight, the body 3–6 mm, the stylar beak 1–2 mm; 2n=16, 32. Native of Eurasia, established in swamps and shallow water from Que. to Me. and Mass. and perhaps elsewhere. June, July.