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treacle mustard, wormseed mustard

Habit Plants annual.
Stems

(0.7)1.5–10(15) dm, ribbed.

Basal leaves

withered by fruiting.

Cauline leaves

middle and upper lanceolate, linear, or elliptic-oblong; (1)2–7(11) × (0.2)0.5–1.2(2.3) cm;

margins subentire, denticulate, or rarely sinuate-dentate; short-petiolate or sessile.

Inflorescences

fruiting pedicels divaricate or ascending, 5–13(16) mm; much narrower than fruits.

Flowers

sepals oblong, 1.8–3.2 mm;

lateral pair not saccate;

petals spatulate, 3–5.5 × 1.5–2 mm, yellow;

claws 1.5–3.5 mm;

petal tips rounded;

median filaments 2–3.5 mm;

ovules (20)30–55 per ovary;

styles slender, 0.5–1.5 mm;

stigmas entire or slightly 2-lobed.

Fruits

4-angled; somewhat torulose; (1)1.5–2.5(4) cm × 1–1.3 mm;

valves with distinct midveins, pubescent outside with 3–5-rayed trichomes, densely pubescent inside.

Seeds

oblong, 1–1.5 × 0.4–0.6 mm;

wings absent.

Trichomes

3–4(5)-rayed.

2n

=16.

Erysimum franciscanum

Erysimum cheiranthoides

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

Pastures, fields, waste grounds, disturbed areas, dry creek beds. Flowering Apr–Aug. 50–1400 m. BR, BW, Col, Lava, WV. CA, ID, NV, WA; throughout Canada and US; Asia, Eu­rope. Exotic.

Source Flora of Oregon, volume 2, page 485
Ihsan Al-Shehbaz
Sibling taxa
E. arenicola, E. capitatum, E. cheiranthoides, E. concinnum, E. inconspicuum, E. occidentale, E. perenne, E. repandum
E. arenicola, E. capitatum, E. concinnum, E. inconspicuum, E. occidentale, E. perenne, E. repandum
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