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field mustard, turnip

elongated mustard

Habit Plants annual or biennial, glabrous or sparsely pubescent basally, rarely glaucous.
Stems

3–12(19) dm.

Basal leaves

and lowermost cauline (5)10–40(60) × 3–10 (20) cm;

margins entire, dentate, or pinnatisect, with terminal lobes larger than 1–6 lateral lobes on each side, petiolate.

Inflorescences

fruiting pedicels ascending to divaricate; (5)10–25(30) mm.

Flowers

sepals oblong; (3)4–6.5(8) mm, ascending;

petals obovate; (5)7–10(13) × (2.5)3–6(7) mm, bright yellow, rarely pale or whitish yellow;

claws 3–7 mm;

anthers oblong, 1.5–2 mm;

filaments 4–6(7) mm;

lateral curved at base;

styles obsolete.

Fruits

divaricate to ascending; terete; (2)3–8(11) cm × 2–4(5) mm, valvular segments (1.3)2–5(7.5) cm, 8–15-seeded per locule;

valves with prominent midveins; terminal segments conical; (0.3)1–2.5(3.5) cm; seedless or rarely 1-seeded, sessile.

Seeds

1–1.8 mm in diameter.

Upper cauline leaves

ovate to lanceolate, 2–8(12) × 0.8–3 cm, bases amplexicaul or auriculate, sessile.

2n

=20.

Brassica rapa

Brassica elongata

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

Abandoned fields, roadsides, disturbed areas, gardens. Flowering Apr–Oct. 0–1500 m. BW, Casc, Col, CR, Est, Lava, Sisk, WV. CA, ID, NV, WA; worldwide. Exotic.

Brassica rapa includes many cultivars. These are recognized as varieties or subspecies, including turnip (ssp. rapa), Chinese mustard or bok choy (ssp. chinensis), and Chinese cabbage or petsai (ssp. pekinensis).

Source Flora of Oregon, volume 2, page 459
Ihsan Al-Shehbaz
Sibling taxa
B. elongata, B. juncea, B. napus, B. nigra, B. oleracea
B. juncea, B. napus, B. nigra, B. oleracea, B. rapa
Synonyms Brassica campestris
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