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hedge mustard

Loesel's tumblemustard, small tumbleweed mustard, tall hedge mustard

Habit Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. Plants annual, densely hispid below with retrorse trichomes, usually glabrous above.
Stems

2.5–7.5(11) dm.

(2)3.5–12(17.5) 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 broadly oblanceolate; (1.5)2.5–8(12) × (1)2–5(7) cm, runcinate to lyrate-pinnatifid;

lateral lobes 2–4 per side;

margins entire or dentate;

petioles 1–4(5) cm.

Cauline leaves

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

similar to basal; uppermost leaves much smaller;

margins entire or toothed.

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, 5–12(15) 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 ascending, 3–4 mm;

petals spatulate, 6–8 × 2–3 mm;

claws 2.5–3.5 mm;

ovules 40–60 per ovary;

styles stout, 0.3–0.7 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, subtorulose; terete, curved or straight, 2–3.5(5) cm × 0.9–1.1 mm; young fruits not overtopping flowers;

valves often glabrous.

Seeds

oblong, 1–1.3 × 0.5–0.6 mm.

0.7–1 × 0.5–0.6 mm.

2n

=14.

=14.

Sisymbrium officinale

Sisymbrium loeselii

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.

Roadsides, disturbed areas, prairies, riverbanks, pastures. Flowering May–Sep. 600–1200 m. BW. CA, ID, NV, WA; scattered in southern Canada and northern US; Asia, Europe. 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. irio, S. linifolium, S. officinale, S. orientale
Synonyms Sisymbrium officinale var. leiocarpum, Sisymbrium officinale var. officinale
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