12.
Rorippa indica
(Linnaeus) Hiern, Cat. Afr. Pl. 1: 24. 1896.
Sisymbrium indicum
Linnaeus, Sp. Pl. ed. 2, 2: 917. 1763;
Radicula indica
(Linnaeus) J. M. Macoun
Annuals;
usually glabrous, rarely sparsely pubescent.
Stems
erect, unbranched or branched proximally or distally, (0.6-)2-6(-7.5) dm.
Basal leaves
not rosulate; blade margins pinnatifid.
Cauline leaves
petiolate (to 4 cm) or (distal) sessile; blade lyrate-pinnatipartite or undivided, obovate, oblong, or lanceolate, (lobes 0 or 1-5 (or 6) on each side), (2.5-)3.5-12(-16) cm × (8-)15-40(-50) mm, base auriculate or not, margins entire, irregularly crenate, or serrate, (entire or denticulate distally).
Racemes
elongated.
Fruiting pedicels
usually ascending or divaricate, rarely slightly reflexed, straight, (2-) 3-10(-15) mm.
Flowers:
sepals ascending, oblong-ovate, 2-3 × 0.8-1.5 mm; petals yellow, obovate or spatulate, (2.5-)3-4(-4.5) × 1-1.5 mm; median filaments 1.5-3 mm; anthers oblong, 0.5-0.8 mm.
Fruits
siliques, often curved-ascending, linear, (7-)10-24(-30) × 1-1.5(-2) mm; ovules (60-)70-110 per ovary; style (0.5-)1-1.5(-2) mm, (slender, narrower than fruit).
Seeds
biseriate or nearly so, reddish brown, ovate or ovate-orbicular, 0.5-0.9 mm (0.4-0.6 mm diam.), foveolate.
2
n
= 16, 24, 32, 48.
Flowering most of the year. Roadsides, wet places, field margins, gardens, streamsides, ditches, flood plains, waste grounds; 0-200[-3200] m; introduced; B.C.; La., Miss., N.Y., Oreg.; Asia; introduced also in Central America, South America.
Nasturtium indicum
(Linnaeus) de Candolle 1821, not Garsault 1764 is a combination and a later homonym of
Rorippa indica
.
