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hedge mustard

flax-leaved plains mustard, lava cress

Habit Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. Plants perennial, glabrous or rarely sparsely pubescent basally; rhizomatous.
Stems

2.5–7.5(11) dm.

(1.5)3–7(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.

not rosulate. 1.5–6 cm;

margins entire; pinnatifid or pinnatisect;

lateral lobes oblong to linear, 0.5–2.5 cm × 0.3–1(2) mm.

Cauline leaves

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

lowermost similar to basal; middle leaves linear, filiform, or oblanceolate;

margins entire, dentate, or pinnately lobed; (1)2.5–9(12) cm × 1–3.5(5) mm; uppermost leaves filiform to linear;

margins entire, sessile or short-petiolate.

Inflorescences

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

bracts 0, fruiting pedicels divaricate to ascending; (3)5–9(11) 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 (3)4–7 mm, ascending;

petals spatulate; (6)8–12 × (1.5)2–4 mm;

claws 2–5 mm;

ovules 60–94 per ovary;

styles 0.5–1 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, not torulose; terete; (2.5)3.5–6.5 cm × 0.9–1.2 mm.

Seeds

oblong, 1–1.3 × 0.5–0.6 mm.

1–2 × 0.4–0.6 mm.

2n

=14.

=14.

Sisymbrium officinale

Sisymbrium linifolium

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.

Rocky or gravelly hillsides, shady rock cliffs, pinyon-juniper areas, sagebrush communities, abandoned fields, sandy prairies. Flowering Apr–Jun. 500–1600 m. BR, BW, Col, Lava, Owy. ID, NV, WA; north to British Columbia, northeast to MT, east to WY, southeast to NM. Native.

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. loeselii, S. officinale, S. orientale
Synonyms Sisymbrium officinale var. leiocarpum, Sisymbrium officinale var. officinale Schoenocrambe linifolia
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