Rorippa amphibia

(Linnaeus) Besser

Enum. Pl., 27. 1821.

WeedyIntroduced
Basionym: Sisymbrium amphibium Linnaeus Sp. Pl. 2: 657. 1753
Synonyms: Armoracia amphibia (Linnaeus) Petermann Brachiolobos amphibius (Linnaeus) Allioni Cochlearia amphibia (Linnaeus) Ledebour Myagrum amphibium (Linnaeus) Loiseleur Nasturtium amphibium (Linnaeus) W. T. Aiton Radicula amphibia (Linnaeus) Druce
Treatment appears in FNA Volume 7. Treatment on page 497. Mentioned on page 494, 495.
Revision as of 11:26, 30 July 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Perennials; (submerged aquatic, rooting from proximal nodes, forming clumps); glabrous or pubescent proximally on young leaves. Stems prostrate basally (hollow), branched, (2–) 4–12 (–13) dm. Basal leaves not rosulate; blade margins pinnatifid. Cauline leaves (proximal) petiolate, (distal) sessile; blade pectinate or pinnatisect to pinnatifid (especially when submerged), oblanceolate to elliptic, 4–12 cm × 5–30 mm, base auriculate or not, margins entire or denticulate to serrate (emergent ones usually undivided, rarely lobed). Racemes considerably elongated. Fruiting pedicels horizontal to reflexed, straight or recurved, (5–) 7–15 (–18) mm. Flowers: sepals erect, oblong, 2.5–3.5 × 1–1.7 mm; petals yellow, obovate, (3.3–) 3.8–5.5 (–6.2) × 1.5–2.5 mm; median filaments 3–4 mm; anthers ovate, 0.7–1 mm. Fruits silicles, straight, ovoid-oblong, (2.5–) 3–5.5 (–7) × 1.7–2.7 (–3) mm; valves glabrous; ovules 36–62 per ovary; style (0.5–) 1–2.2 (–2.5) mm. Seeds biseriate, reddish-brown, ovoid, 0.7–1 mm (0.5–0.6 mm diam.), colliculate. 2n = 16, 32.


Phenology: Flowering Jun–Aug.
Habitat: Lakeshores, marshes, ponds, streams

Distribution

V7 769-distribution-map.gif

Introduced; Que., Maine, N.Y., Europe, Asia

Discussion

Selected References

None.

Lower Taxa

None.

"elongated" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Rorippa amphibia"
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Ihsan A. Al-Shehbaz +
(Linnaeus) Besser +
not +  and auriculate +
Sisymbrium amphibium +
appendaged +  and unappendaged +
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
pinnatisect;pinnatifid oblanceolate +
much smaller +  and reduced +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
sessile +  and petiolate +
well-developed +
distinct +
not +  and undifferentiated +
not +  and differentiated +
emarginate +  and entire +
Que. +, Maine +, N.Y. +, Europe +  and Asia +
straight +  and curved +
not winged +  and unappendaged +
connate +  and distinct +
actinomorphic +
pink;white;yellow +
spreading +  and erect +
oblanceolate +, oblong +, spatulate +, obovate +  and ovate +
latiseptate +, stipitate +  and sessile +
terete +, torulose +, globose +, subglobose +, pyriform +, ellipsoid +, ovoid +, oblong +  and linear +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
Lakeshores, marshes, ponds, streams +
sessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
denticulate;serrate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
3.8mm;5.5mm +
rudimentary +
obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Flowering Jun–Aug. +
trinucleate +  and 3(-11)-colpate +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
recurved +, horizontal +  and reflexed +
slender +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not +  and mucilaginous +
not +  and mucilaginous +
reddish-brown +
colliculate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
persistent +  and caducous +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
perforate +  and complete +
reduced +
latiseptate +, stipitate +  and sessile +
terete +, torulose +, globose +, subglobose +, pyriform +, ellipsoid +, ovoid +, oblong +  and linear +
latiseptate +, stipitate +  and sessile +
terete +, torulose +, globose +, subglobose +, pyriform +, ellipsoid +, ovoid +, oblong +  and linear +
Weedy +  and Introduced +
tetradynamous +
procumbent +  and decumbent +
prostrate +  and erect +
2-lobed +, entire +, conical +  and capitate +
subsessile +, sessile +  and petiolate +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
persistent +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Armoracia amphibia +, Brachiolobos amphibius +, Cochlearia amphibia +, Myagrum amphibium +, Nasturtium amphibium +  and Radicula amphibia +
Rorippa amphibia +
species +
scale-like +  and forked +
leathery +  and papery +
anastomosing +
pubescent +  and glabrous +
rhizomatous +, taprooted +, scapose +  and not +
perennial +, biennial +  and annual +
subshrub +  and herb +
aquatics +  and terrestrial +
glabrous +  and pubescent +