Nasturtium officinale |
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common watercress, nasturtium, two-rowed water-cress, water cress |
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Habit | Plants glabrous throughout or sparsely pubescent. |
Stems | 1–11(–20) dm. |
Cauline leaves | petiole not winged, base auriculate; blade 3–9(–13)-foliolate, (1–)2–15(–22) cm; lateral leaflets sessile or petiolulate, rachis not winged, blade smaller than terminal; terminal leaflet (or simple blade) suborbicular to ovate, or oblong to lanceolate, (0.4–)1–4(–5) cm × (3–)7–25(–40) mm, base obtuse, cuneate, or subcordate, margins entire or repand, apex obtuse. |
Flowers | sepals 2–3.5 × 0.9–1.6 mm; petals white or pink, spatulate or obovate, 2.8–4.5(–6) × 1.5–2.5 mm, (base to 1 mm), apex rounded; filaments 2–3.5 mm; anthers 0.6–1 mm. |
Fruiting pedicels | divaricate or descending, straight or recurved, 5–17(–24) mm. |
Fruits | (0.6–)1–1.8(–2.5) cm × (1.8–)2–2.5(–3) mm; ovules (28–)36–60 per ovary; style 0.5–1(–1.5) mm. |
Seeds | biseriate, reddish brown, ovoid, (0.8–)0.9–1.1(–1.3) × (0.6–)0.7–0.9(–1) mm, coarsely reticulate with 25–50(–60) areolae on each side. |
2n | = 32. |
Nasturtium officinale |
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Phenology | Flowering Feb–Sep. |
Habitat | Flowing streams, ditches, lake margins, swamps, marshes, seeps |
Elevation | 0-3000 m (0-9800 ft) |
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; ON; PE; QC; Europe; Asia; n Africa [Introduced in North America; introduced also elsewhere in the New World, tropical and s Africa, Australia]
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Source | FNA vol. 7, p. 490. |
Parent taxa | Brassicaceae > tribe Cardamineae > Nasturtium |
Sibling taxa | |
Synonyms | Sisymbrium nasturtium-aquaticum, Rorippa nasturtium-aquaticum |
Name authority | W. T. Aiton: in W. Aiton and W. T. Aiton, Hortus Kew. 4: 110. (1812) |
Web links |
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