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Rorippa sylvestris (Linn.) Besser, Enum. Pl. Volh. 27. 1822. Vas. in Kom., l.c. 138; Hedge in Rech. f., l.c. 217.
Nasturtium sylvestre (L) R.Br.Sisymbrium sylvestre Linn.
Perennial, stoloniferous, 20-50 cm tall, suberect or procumbent with ascending branches, ± glabrous. Leaves pinnate or deeply pinnatisect, lower stalked, upper subsessile or sessile; lobes obovate to oblong, cuneate, sinuate-toothed to subentire, apex rounded. Racemes (20-) 30-60-flowered, up to 15 cm long in fruit. Flowers 4-5 mm across, yellow; pedicels up to 10 (-12) mm long in fruit, spreading. Sepals c. 2.5 mm long. Petals 4-5 mm long, 1.5-2 mm broad. Stamens c. 2:3 mm long. Siliquae 9-18 mm long, 1.5-2 (-2.5) mm broad, linear-oblong, cylindrical, glabrous; style c. 1 mm long with capitate stigma; seeds many, ± biseriate, c. 0.7 mm long.
Fl. Per.: May-August.
Type: Described from Europe (Switzerland, Germany, France), Herb. Linn. no. 836/6 (LINN).
Distribution: Temperate Eurasia.
It seems to be rare in our area, but distinct by its bright yellow flowers with conspicuous petals and much dissected leaves. Leaves may confuse with some Cardamine species but yellow flowers are distinctive.
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