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Syrian mustard

Habit Herbs annual, scabrous pubescent throughout.
Stems

(4)10–40(45) cm, rigidly branched.

Basal leaves

not rosulate;

margins entire, dentate, or pinnatifid, petiolate.

Cauline leaves

oblong, lanceolate, or elliptic; (1)1.5–7(9) × (0.3)0.7–2(3) cm, bases not auriculate;

margins entire, dentate;

petioles (0.2)0.5–2(2.5) cm; to sessile or subsessile distally.

Inflorescences

bracts 0, fruiting pedicels appressed to rachis; stout, 0.5–1(1.2) mm, nearly half as wide as fruit.

Flowers

sepals erect, caducous; ovate to oblong, 0.6–0.9 mm;

lateral pair not saccate;

petals narrowly spatulate, 0.9–1.3 × 0.1–0.2 mm, slightly > sepals, white;

claws slightly differentiated from blades, 0.4–0.6 mm, nectar glands 4, 1 on each side of lateral stamens;

stamens 6, slightly tetradynamous;

anthers ovate;

tips pointed;

ovules 2 per ovary;

septa complete, thickened;

styles persistent, subconical; beak-like, curved; stout, 1–1.8 mm, sparsely pubescent;

stigmas capitate, 2-lobed;

lobes not decurrent.

Fruits

nutlet-like silicles, 2-seeded, indehiscent; erect, appressed to rachis; ovoid, subterete to slightly 4-angled, 2–2.5 × 1.5–2 mm, scabrous, unsegmented;

valves woody; veinless; replums strongly expanded laterally.

Seeds

aseriate, oblong, 1.3–1.7 × 0.8–1.2 mm, brown, not mucilaginous when wetted; wingless;

cotyledons accumbent.

Trichomes

minutely stalked, 2-forked, mixed with fewer simple and rarely 3-forked.

2n

=14.

Euclidium syriacum

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Waste places, roadsides. Flowering May–Jun. 300–1000 m. BW, Col, Owy. CA, ID, NV, WA; northeast to MT, east to NE, southeast to CO, MA; Asia, Europe. Exotic.

Source Flora of Oregon, volume 2, page 486
Ihsan Al-Shehbaz
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