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Rorippa palustris (L.) Besser
BOG YELLOWCRESS
Marsh Watercress; Yellow Cress; Yellow Marsh-cress; Marsh Yellow-cress; Marsh Cress; Sisymbrium amphibium var palustre L; Sisymbrium palustre L Leyss; Nasturtium palustre L Dc; Nasturtium terrestre With Aiton; Sisymbrium terrestre With; Nasturtium semipinnatifidum Hook; Nasturtium terrestre var semipinnatifidum Hook Hookf; Cardamine palustris f barbareaefolia Delile Kuntze; Sisymbrium barbareaefolium Delile; Nasturtium palustre; Rorippa islandica

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Rorippa palustris
© Copyright Mel Harte 2010 · 3
Rorippa palustris
Rorippa palustris
© Copyright Mel Harte 2010 · 3
Rorippa palustris

Rorippa palustris
© Copyright Mel Harte 2010 · 3
Rorippa palustris
Rorippa palustris
© Copyright Mel Harte 2010 · 3
Rorippa palustris

Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris
Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris

Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris
Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris

Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris
Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris

Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris
Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris

Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris
Rorippa palustris
© Copyright Malcolm Storey 2011-2118 · 3
Rorippa palustris

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo candida @ BPI (2)
Aphididae  Lipaphis erysimi @ AMNH_PBI (1)
Mycosphaerellaceae  Cercospora nasturtii @ BPI (1)
Peronosporaceae  Peronospora parasitica @ BPI (1)

Peronospora roripae-islandicae @ BPI (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Rorippa palustris (L.) Bess. var. palustris ( Rorippa islandica var. microcarpa ) Bog Yellowcress
Brassicaceae — Mustard family
Native
Rorippa palustris var. palustris
Cedar Swamp Wildlife Area
June 2002

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Photos copyright David G. Smith

Delaware Wildflowers main page

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FNA | Family List | FNA Vol. 7 | Brassicaceae | Rorippa

14. Rorippa palustris (Linnaeus) Besser, Enum. Pl. 27. 1821. (as Roripa).

Sisymbrium amphibium Linnaeus var. palustre Linnaeus, Sp. Pl. 2: 657. 1753; Brachiolobos palustris (Linnaeus) Clairville; Cardamine palustris (Linnaeus) Kuntze; Caroli-Gmelina palustris (Linnaeus) P. Gaertner, B. Meyer & Scherbius; Myagrum palustre (Linnaeus) Lamarck; Nasturtium palustre (Linnaeus) de Candolle; Radicula palustris (Linnaeus) Moench

Annuals or, rarely, perennials; (short-lived, terrestrial or of wet habitat, not submerged); usually glabrous, rarely hirsute, (trichomes cylindrical). Stems (often simple from base), erect, branched distally, (0.5-)1-10 (-14) dm, (sometimes hirsute proximally). Basal leaves rosulate; blade [(4-)6-20(-30) cm × 10-50(-80) mm] margins lyrate-pinnatisect, (abaxial surface sometimes hirsute). Cauline leaves petiolate or subsessile; blade lyrate-pinnatisect, (lateral lobes oblong or ovate when present), (1.5-)2.5-10(-18) cm × (5-)8-25(-30) mm, (lateral lobes smaller than terminal), base auriculate or amplexicaul, margins subentire or irregularly dentate, sinuate, serrate, or crenate, (abaxial surface sometimes hirsute). Racemes often considerably elongated. Fruiting pedicels divaricate or slightly to strongly reflexed, straight or curved, (2.5-)3-10(-14) mm. Flowers: sepals erect, oblong, 1.5-2.4(-2.6) × 0.5-1 mm; petals yellow or pale yellow, spatulate, (1.5-)1.8-2.5(-3) × 0.5-1.5(-2) mm; median filaments 1-2.5 mm; anthers ovate, 0.3-0.5 mm. Fruits usually silicles, rarely siliques, often slightly curved, oblong, ellipsoid, or oblong-ovoid, (2.5-)4-10 × (1.5-)1.7-3(-3.5) mm; ovules 20-90 per ovary; style 0.2-1(-1.2) mm. Seeds biseriate, brown to yellowish brown, ovoid or subglobose, 0.5-0.7(-0.9) mm (0.4- 0.6(-0.7) mm diam.), colliculate.

Subspecies 2 (2 in the flora): North America, Europe, Asia; introduced in n Mexico, South America, Australia.

Updated: 2021-01-19 03:29:44 gmt
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