Compilation
Nasturtium polymorphum

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Name

Identification
Nasturtium polymorphum Nutt. [family BRASSICACEAE ] Rorippa curvisiliqua (S.Watson) Stuckey [family BRASSICACEAE ] (stored under name);
Related name
  • Nasturtium curvisiliqua
  • Rorippa curvisiliqua
  • Nasturtium polymorphum
  • Rorippa sinuata

Flora

Entry for Rorippa curvisiliqua (Hooker) Bessey ex Britton [family CRUCIFERAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 7,
Names
Rorippa curvisiliqua (Hooker) Bessey ex Britton [family CRUCIFERAE], Mem. Torrey Bot. Club, 5: 169. 1894
Sisymbrium curvisiliqua Hooker [family CRUCIFERAE], Fl. Bor.-Amer., 1: 61. 1830
Nasturtium curvisiliqua (Hooker) Nuttall [family CRUCIFERAE]
Nasturtium curvisiliqua var. lyratum (Nuttall) S. Watson [family CRUCIFERAE]
Nasturtium curvisiliqua var. nuttallii S. Watson [family CRUCIFERAE]
Nasturtium lyratum Nuttall [family CRUCIFERAE]
Nasturtium occidentale Greene [family CRUCIFERAE]
Nasturtium polymorphum Nuttall [family CRUCIFERAE]
Radicula curvisiliqua (Hooker) Greene [family ]
Radicula lyrata (Nuttall) Greene [family ]
Radicula multicaulis (Greene) Greene [family ]
Radicula nuttallii (S. Watson) Greene [family ]
Radicula occidentalis (Greene) Greene [family ]
Radicula pectinata (A. Nelson) A. Heller [family ]
Radicula polymorpha (Nuttall) Greene [family ]
Rorippa curvisiliqua var. lyrata (Nuttall) C. L. Hitchcock [family CRUCIFERAE]
Rorippa curvisiliqua var. nuttallii (S. Watson) Stuckey [family CRUCIFERAE]
Rorippa curvisiliqua var. occidentalis (Greene) Stuckey [family CRUCIFERAE]
Rorippa curvisiliqua var. orientalis Stuckey [family CRUCIFERAE]
Rorippa curvisiliqua var. procumbens Stuckey [family CRUCIFERAE]
Rorippa curvisiliqua var. spatulata Stuckey [family CRUCIFERAE]
Rorippa lyrata (Nuttall) Greene [family CRUCIFERAE]
Rorippa multicaulis Greene [family CRUCIFERAE]
Rorippa nuttallii (S. Watson) Rydberg [family CRUCIFERAE]
Rorippa occidentalis (Greene) Greene [family CRUCIFERAE]
Rorippa pectinata A. Nelson [family CRUCIFERAE]
Rorippa polymorpha (Nuttall) Howell [family CRUCIFERAE]
Treatment Author(s)
Ihsan A. Al-Shehbaz
Information
Annuals; usually glabrous, sometimes sparsely hirsute, (trichomes cylindrical). Stems (usually few-branched from base, rarely simple), ascending or decumbent to prostrate, (0.5–)1–4(–6) dm, branched distally, (glabrous or hirsute proximally). Basal leaves not rosulate; blade margins pinnatifid. Cauline leaves petiolate or sessile; blade oblong, oblanceolate to spatulate, or obovate, (lateral lobes linear to oblong or ovate), (2–)3–9(–13) cm × 8–20(–35) mm, (lateral lobe smaller than terminal), base auriculate, margins usually pinnatifid to pinnatisect, rarely pectinate, or (terminal lobe) entire or dentate. Racemes considerably elongated. Fruiting pedicels divaricate-ascending to horizontal, straight, 1–4.5(–9) mm, (glabrous or sparsely pubescent). Flowers: sepals (rarely persistent), ascending, oblong, 0.8–2(–2.5) × 0.6–1.4 mm; petals (spreading), yellow, oblong to oblanceolate, 0.6–1.8(–2) × 0.3–1.3 mm; median filaments 1–1.7 mm; anthers ovate, 0.4–0.5 mm. Fruits siliques, curved-ascending, oblong to linear, 4–13(–18) × 1–2 mm; valves glabrous; ovules (30–)42–106 per ovary; style 0.1–0.8 mm. Seeds biseriate, brown, cordiform, 0.5–0.7 mm, colliculate. 2n = 16.
Phenology
may (spring), jun-aug (summer), sep-oct (fall)
Altitude range
50–3100 m;
Distribution
USA AlaskaUSA Calif.USA IdahoUSA Mont.USA Nev.USA Oreg.USA Wash.USA Wyo.Canada B.C.
Discussion
Rorippa curvisiliqua is a highly variable species divided artificially by R. L. Stuckey (1972) into seven varieties. They were only reluctantly recognized by R. C. Rollins (1993) and N. H. Holmgren (2005b), though these authors felt, and I concur, that it is impossible to determine any of them reliably. A collection from New Brunswick, Blaney s.n. (DAO, MO, NBM, UNB), Northumberland County, 2 Sep 2004, was most likely introduced by migratory birds.

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