Watercress - Rorippa nasturtium-aquaticum
Nearly glabrous perennial from fibrous-rooted rhizomes. Stems prostrate or floating, hollow, 10–70 cm long. Leaves all cauline, petiolate, 3–15 cm long; the blades simple and suborbicular or pinnately compound with lanceolate to elliptic lateral lobes and a larger, usually cordate terminal segment. Petals white, 3–5 mm long. Fruit a linear silique, 8–18 mm long, 1.8–2.6 mm wide, flattened; style 0.3–1 mm long; pedicels spreading to ascending, 6–15 mm long, the lowest often in leaf axils (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus rufocinctus
(Thorp et al. 1983).