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bluntleaf yellowcress, common yellowcress

spreading yellowcress, western yellowcress

Habit Plants perennial, pubescent with hemispheric or clavate vesicular trichomes; with rhizomes or creeping roots.
Stems

decumbent or prostrate, 1–4.2(5) dm.

Basal leaves

not rosulate; pinnatifid.

Cauline leaves

oblong, oblanceolate, or lanceolate; (1.5)2.5–6.5(9) × 0.5–1.8(2.5) cm, bases uppermost auriculate;

margins pinnatifid or sinuate, sessile.

Inflorescences

fruiting pedicels divaricate to horizontal, sigmoid or recurved, 4–12(15) mm.

Flowers

sepals ascending, caducous, oblong, 2.2–3.7(4.5) mm;

petals oblanceolate to spatulate; (2.7)3.2–5.3(6) × 1.5–2.5 mm;

ovules (30)50–82(98) per ovary;

styles 1–2.5(3.5) mm.

Fruits

siliques, oblong to lanceolate or linear, curved; (4)4.7–11.5(16) × (1)1.5–2.5 mm;

valves glabrous or with vesicular trichomes;

septa complete.

Seeds

biseriate, angular cordiform, 0.7–1 × 0.5–0.6 mm, yellow-brown.

2n

=16.

Rorippa curvipes

Rorippa sinuata

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Shores of ponds and lakes, streambanks, fields, ditches. Flowering May–Jul. 900–2000 m. BR, Owy. CA, ID, NV, WA; southern Canada, throughout US except eastern seaboard. Native.

Source Flora of Oregon, volume 2, page 507
Ihsan Al-Shehbaz
Sibling taxa
R. austriaca, R. columbiae, R. curvisiliqua, R. indica, R. palustris, R. sinuata, R. sylvestris, R. tenerrima
R. austriaca, R. columbiae, R. curvipes, R. curvisiliqua, R. indica, R. palustris, R. sylvestris, R. tenerrima
Synonyms Rorippa curvipes var. curvipes, Rorippa curvipes var. truncata
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