Marsh yellowcress – Rorippa palustris

Marsh yellowcress

Rorippa palustris L. (Bess)
Brassicaceae (Mustard family)

Life cycle

Taprooted annual or biennial. Occasionally, a weak perennial.

Leaves

Alternate, variably shaped leaves initially develop from a basal rosette. Leaves are deeply lobed with a large terminal lobe and three to seven other lobes. The upper stem leaves are smaller with lobed to toothed margins and, occasionally, winged petioles with earlobe-shaped bases.

Stems

Branched or unbranched stems arise from a basal rosette to flower, usually less than 2  feet in height.

Flowers and fruit

Small, light yellow flowers with four petals are found in terminal clusters. Fruit are small, globe- to short cylinder-shaped capsules with a slight upward curve. Each capsule contains numerous, tiny, yellowish brown seeds.

Reproduction

Seeds.

Similar weeds

Yellow fieldcress [Rorippa sylvestris (L.) Bess.]
Differs by having a perennial nature with prolific, aggressive creeping roots and more deeply lobed leaves. Flowers are more conspicuous and brightly colored. Capsules are smaller and usually do not contain seeds.

Marsh-yellowcress-plant-300x240
Marsh yellowcress plant
Marsh-yellowcress-rosette-300x240
Marsh yellowcress rosette
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Marsh yellowcress flower

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