Rorippa

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  R. aquatica

  1a. Petals white; submersed leaf blades highly dissected into narrow segments; septum incomplete, residual as narrow strips on the inner margins of the replum
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  1b. Petals yellow or absent; leaf blades subentire to pinnately lobed; septum complete
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    R. sessiliflora

    2a. Petals absent; fruiting pedicels 0.5–1.5 (–2) mm long
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    2b. Petals present; fruiting pedicels 2–15 mm long
    • See list of 2 species in 3a
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      3a. Petals 0.7–3.5 mm long, shorter than to approximately equaling the length of the sepals; plants usually annual or biennial (rarely short-lived perennial), from tap roots; anthers 0.2–0.5 mm long
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        R. palustris

        4a. Silicles ovoid-obloid to broad-ovoid, (2–) 3–10 mm long; seeds papillose; petals 0.8–3.5 mm long; abaxial leaf blades and lower stem glabrous or pubescent
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        R. globosa

        4b. Silicles spherical to subspherical, 2–3 (–3.5) mm long; seeds reticulate-patterned; petals 0.7–1.3 (–1.5) mm long; abaxial leaf blades and lower stem pubescent
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      3b. Petals (2–) 2.8–5.5 mm long, longer than the sepals; plants perennial from rhizomes or creeping stem bases; anthers 0.4–1.3 mm long
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        R. sylvestris

        5a. Fertile siliques 10–20 mm long, linear in outline, those from unfertilized ovaries developing only 4–8 (–10) mm long; middle and upper stem leaves usually pinnately lobed to pinnately divided
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        5b. Siliques (2.5–) 3–5 (–6) mm long, ovoid-obloid to subspherical; middle and upper stem leaves entire to coarsely serrate
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          R. amphibia

          6a. Fruiting pedicels weakly sigmoid-curved downward to somewhat recurved [Fig. 525]; silicles ovoid-obloid [Fig. 525]; stem leaves clasping at the base or, more commonly, not clasping
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          R. austriaca

          6b. Fruiting pedicels straight, widely ascending [Fig. 526]; silicles spherical or subspherical [Fig. 526]; lower and middle stems leaves auriculate-clasping

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 Show photos of:   Each photo represents one species in this genus.