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hedge mustard

London rocket

Habit Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. Plants annual, glabrous or sparsely pubescent at least below.
Stems

2.5–7.5(11) dm.

(1)2–6(7.5) dm.

Basal leaves

usually rosulate;

blades (2)3–10(15) × (1)2–5(8) cm, lyrate-pinnatifid; pinnatisect, or runcinate;

lateral lobes 2–4(5) per side;

margins entire, dentate, or lobed;

petioles (1)2–7(10) cm.

rosulate;

blades oblanceolate or oblong in outline; (1.5)3–12(15) × (0.5)1–6(9) cm, runcinate to pinnatisect;

lateral lobes (1)2–6(8) per side; < terminal lobe;

margins entire, dentate, or lobed;

petioles (0.5)1–4.5(6) cm.

Cauline leaves

similar to basal; uppermost leaves smaller, lobed, dentate, or subentire.

lower similar to basal; uppermost smaller.

Inflorescences

bracts 0, fruiting pedicels erect, appressed to rachis; stout, 1.5–3(4) mm; narrower than fruits.

bracts 0, fruiting pedicels divaricate or ascending; (5)7–12(20) mm; narrower than fruits.

Flowers

sepals erect, 2–2.5 mm;

petals spatulate, 2.5–4 × 1–2 mm;

claws 1–2 mm;

ovules 10–20 per ovary;

styles (0.8)1–1.5(2) mm;

stigmas slightly 2-lobed.

sepals erect, 2–2.5 mm;

petals oblong-oblanceolate, 2.5–3.5(4) × 1–1.5 mm;

claws 1–1.5 mm;

ovules 40–90 per ovary;

styles 0.2–0.5 mm;

stigmas prominently 2-lobed.

Fruits

appressed to rachis, slightly torulose or not; terete; stout; straight subulate-linear; (0.7)1–1.4(1.8) cm × 1–1.5 mm;

valves glabrous or pubescent.

not appressed to rachis, narrowly linear, slightly torulose; terete; (2.5)3–4(5) cm × 0.9–1.1 mm; young fruits overtopping flowers;

valves glabrous.

Seeds

oblong, 1–1.3 × 0.5–0.6 mm.

0.8–1 × 0.5–0.6 mm.

2n

=14.

=14.

Sisymbrium officinale

Sisymbrium irio

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

Fields, roadsides, pastures, disturbed areas, deserts. Flowering Mar–Aug. 0–1900 m. Casc, CR, Est, Sisk, WV. CA, ID, NV, WA; scattered throughout North America; Africa, Asia, Europe. Exotic.

Pastures, disturbed areas, rocky slopes, fields, orchards, prairies. Flowering Jan–May. 0–50 m. WV. CA, NV; scattered in North America; scattered nearly worldwide. Exotic.

Source Flora of Oregon, volume 2, page 510
Ihsan Al-Shehbaz
Flora of Oregon, volume 2, page 509
Ihsan Al-Shehbaz
Sibling taxa
S. altissimum, S. irio, S. linifolium, S. loeselii, S. orientale
S. altissimum, S. linifolium, S. loeselii, S. officinale, S. orientale
Synonyms Sisymbrium officinale var. leiocarpum, Sisymbrium officinale var. officinale
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