Descurainia californica |
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California tansymustard, Sierra tansy mustard |
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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 |
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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 |
AZ; CA; CO; NM; NV; OR; UT; WY
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Source | FNA vol. 7, p. 521. |
Parent taxa | |
Sibling taxa | |
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) |
Web links |