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Volume IV (1988) - Flora of New Zealand Naturalised Pteridophytes, Gymnosperms, Dicotyledons
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Rorippa Scop.

RORIPPA Scop.

Annual, biennial or perennial rhizomatous trailing or taprooted herbs. Hairs simple, or 0. Stems prostrate to erect, leafy. Lvs simple to pinnate; margins of lobes entire or crenate or dentate. Racemes ebracteate. Sepals erecto-patent, saccate or not. Petals yellow or white. Stamens 6, without appendages. Nectaries 6, 4 lateral and 2 median, variable in form and degree of fusion. Style very short; stigma capitate or slightly 2-lobed. Fr. a globose to ovoid silicle or oblong to linear silique, often curved, dehiscent; valves veinless or 1-veined at least below; beak 0. Seeds oblong or ovoid, winged or not winged, in 1-2 rows per locule.

Key

1
Petals c. 2× length of sepals; plant either rhizomatous or stems trailing and rooting at nodes
2
Petals c. = sepals; plant taprooted, ± erect
5
2
Petals white; stems trailing and rooting at nodes; lvs pinnate
3
Petals yellow; plant rhizomatous but aerial stems erect; lvs simple, toothed to deeply pinnatifid
4
3
Seeds distinctly in 2 rows per cell, with 20-50 depressions per face; sepals 1.5-2.5 mm long
3. *nasturtium-aquaticum
Seeds ± in 1 row per cell, with 100-150 depressions per face; sepals 2.5-3.5 mm long
2. *microphylla
4
Fr. a linear silique, 10-15 mm long; fruiting pedicel c. = silique
4. *sylvestris
Fr. an elliptic to ovoid silicle, 3-6 mm long; fruiting pedicel at least 2× silicle
1. *amphibia
5
Petals white; silique 15-30 × 1-1.5 mm; seeds in 1 row per cell
5. divaricata
Petals yellow; silicle (2)-4-7 × 2-3 mm; seeds in 2 rows per cell
6. palustris

c. 70 spp., mostly temperate Europe and N. America but also Asia, Australasia, Africa, S. America. Native spp. 2, naturalised 4.

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