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California tansymustard, Sierra tansy mustard

Habit Annuals or biennials; eglandular; usually pubescent, trichomes dendritic, sometimes glabrous distally.
Stems

erect, unbranched basally, branched distally, (1.3–)2–10.5(–13.5) dm.

Basal leaves

petiole 0.4–4.2 cm;

blade pinnate, oblanceolate to obovate in outline, 1.5–6 cm, lateral lobes [2–4 (or 5) pairs], lanceolate, (5–22 × 1–5 mm), margins usually entire or crenate to incised, rarely lobed.

Cauline leaves

sessile or shortly petiolate;

blade smaller distally, distal lobes often narrower, surfaces sparsely pubescent.

Racemes

considerably elongated in fruit.

Flowers

sepals spreading, yellowish, oblong, 0.9–1.5 mm, glabrous;

petals oblanceolate, 1.1–1.8 × 0.4–0.6 mm;

median filaments 0.8–1.4 mm;

anthers 0.3–0.4 mm.

Fruiting pedicels

divaricate to ascending or suberect, often straight, 3–9(–11) mm.

Fruits

divaricate to erect, fusiform, not torulose, (2–)3–5(–6) × (0.8–)1–1.3 mm, (long-acute at both ends);

valves each with obscure midvein;

septum not veined;

ovules 4–12 per ovary;

style (0.2–)0.3–0.6(–0.8) mm, glabrous.

Seeds

uniseriate, light brown, ellipsoid, 1–1.4 × 0.6–0.8 mm.

2n

= 14.

Descurainia californica

Phenology Flowering Jun–Aug.
Habitat Disturbed areas in pinyon-juniper, dry hillsides, decomposed granite slopes, sagebrush, moist roadsides, open woods, fir-spruce or aspen communities, gravel and talus slopes
Elevation 1700-3400 m (5600-11200 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; OR; UT; WY
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 7, p. 521.
Parent taxa Brassicaceae > tribe Descurainieae > Descurainia
Sibling taxa
D. adenophora, D. brevisiliqua, D. incana, D. incisa, D. kenheilii, D. longepedicellata, D. nelsonii, D. obtusa, D. paradisa, D. pinnata, D. sophia, D. sophioides, D. torulosa
Synonyms Smelowskia californica, Sisymbrium californicum, Sophia leptostylis
Name authority (A. Gray) O. E. Schulz: in H. G. A. Engler, Pflanzenr. 86[IV,105]: 330. (1924)
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