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hedge mustard

Habit Plants annual, hirsute with retrorse trichomes, rarely subglabrous above.
Stems

2.5–7.5(11) 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.

Cauline leaves

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

Inflorescences

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

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.

Seeds

oblong, 1–1.3 × 0.5–0.6 mm.

2n

=14.

Sisymbrium officinale

Distribution
[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.

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