Descurainia sophioides |
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northern tansy-mustard |
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Habit | Annuals or biennials; eglandular or glandular distally; glabrate to moderately pubescent, trichomes dendritic, sometimes mixed with simple ones. |
Stems | erect, unbranched or sometimes branched distally, (0.5–)1.5–11(–18) dm. |
Basal leaves | petiole 0.5–5 cm; blade pinnate or, sometimes, 2-pinnate, broadly oblanceolate to ovate in outline, 2.5–11.4(–15.2) cm, lateral lobes lanceolate, (to 10 × 4 mm), margins incised. |
Cauline leaves | sessile or shortly petiolate; blade smaller distally, distal lobes often narrower, surfaces often glabrous or sparsely pubescent. |
Racemes | elongated or not in fruit, (flowers overtopped by developing fruits). |
Flowers | sepals erect, yellowish, oblong, 1.6–2.7 mm, glabrous; petals narrowly oblanceolate, 2–2.5 × 0.3–0.6 mm; median filaments 2.5–3.5 mm; anthers 0.3–0.4 mm. |
Fruiting pedicels | divaricate to ascending, (often recurved in age), slender, (3–)4–9(–13) mm. |
Fruits | erect to widely spreading, narrowly linear, slightly torulose, (9–)14–30(–34) × 0.6–1.1 mm, (usually terete, rarely slightly flattened, often curved inward); valves each with obscure midvein; septum not veined; ovules 30–62 per ovary; style obsolete, 0.07–0.3 mm, glabrous. |
Seeds | uniseriate, light brown, narrowly oblong, 1–1.5 × 0.3–0.5 mm. |
2n | = 14. |
Descurainia sophioides |
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Phenology | Flowering Jun–Sep. |
Habitat | Open meadows, eroded peat, roadsides, disturbed and waste sites, rocky outcrops, mining dumps, gravelly grounds, stream banks, gullies |
Elevation | 0-1000 m (0-3300 ft) |
Distribution |
AK; BC; MB; NT; NU; YT; Asia (Russian Far East, Siberia) |
Source | FNA vol. 7, p. 529. |
Parent taxa | Brassicaceae > tribe Descurainieae > Descurainia |
Sibling taxa | |
Synonyms | Sisymbrium sophioides, Hesperis arctica, Sisymbrium arcticum, Sophia sophioides |
Name authority | (Fischer ex Hooker) O. E. Schulz: in H. G. A. Engler, Pflanzenr. 86[IV,105]: 316. (1924) |
Web links |