Strigosella |
Strigosella africana |
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strigosella |
African mustard |
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Habit | Annuals; not scapose; pubescent [glabrous], trichomes simple and stalked, forked or dendritic. | Plants usually sparsely to densely pubescent, rarely glabrescent, trichomes short-stalked, forked or subdendritic, these, sometimes, with simple, subsetiform ones. |
Stems | erect or ascending, unbranched or branched. |
unbranched or branched proximally, (0.4–)1.5–3(–5) dm, pubescent. |
Leaves | basal and cauline; petiolate or subsessile; basal not rosulate, petiolate, blade margins entire, dentate, or pinnatifid; cauline petiolate or subsessile, blade margins usually entire or dentate, rarely sinuate [lobed]. |
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Basal leaves | soon withered. |
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Cauline leaves | petiolate or (distal) subsessile; petiole (0.1–)0.6–2(–3) cm; blade elliptic, oblanceolate, or oblong, (0.5–)1.5–6(–10) cm × (3–)10–25(–35) mm (smaller distally), base cuneate, apex acute. |
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Racemes | (few- to several-flowered), considerably elongated in fruit. |
rachis straight or slightly flexuous. |
Flowers | sepals narrowly oblong [ovate], pubescent; petals pink or purple [rarely white], oblanceolate [spatulate, oblong], (longer than sepals), claw undifferentiated from blade, (apex obtuse or rounded); stamens tetradynamous, (erect); filaments not dilated basally [sometimes median 4 connate in 2 pairs]; anthers oblong [ovate], (apiculate or not); nectar glands (4), lateral, 1 on each side of lateral stamen, median glands absent. |
sepals sometimes persistent, (3.5–)4–5 × 0.5–0.7 mm; petals narrowly oblanceolate, (6.5–)8–10(–12) × 1–2 mm; filaments distinct, 2.5–5 mm; anthers narrowly oblong, 0.9–1.1 mm. |
Fruiting pedicels | ascending or divaricate, stout [slender] (about equal to fruits). |
0.5–2(–4) mm. |
Fruits | siliques, subsessile, linear, smooth [torulose], 4-angled [terete]; valves each with obscure [prominent] midvein, pubescent or glabrous; replum rounded; septum complete; ovules 40–80 per ovary; style obsolete; stigma conical, 2-lobed (lobes connivent or connate, opposite replum). |
divaricate-ascending, straight, (2.5–)3.5–5.5(–7) cm × 1–1.3 mm; valves usually pubescent, rarely glabrous, trichomes coarse and forked, these mixed with smaller, forked, subdendritic, or simple, subsetiform ones; stigma to 1 mm. |
Seeds | uniseriate, plump or slightly flattened, not winged, oblong [ovate]; seed coat (reticulate), not mucilaginous when wetted; cotyledons incumbent. |
1–1.2 × 0.5–0.6 mm. |
x | = 7. |
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2n | = 14, 28. |
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Strigosella |
Strigosella africana |
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Phenology | Flowering May–Aug. | |
Habitat | Fields, disturbed areas, roadsides, deserts, sandy flats, vacant lots, sagebrush and greasewood areas, grasslands, railroad tracks, shale outcrops, alkaline flats, juniper woodlands, plains | |
Elevation | 600-2400 m (2000-7900 ft) | |
Distribution | Europe; c Asia; w Asia; n Africa [Introduced in North America] |
AZ; CA; CO; ID; MT; NV; OR; UT; WY; Europe; Asia; n Africa [Introduced in North America; introduced also in South America (Argentina)]
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Discussion | Species 20 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 553. | FNA vol. 7, p. 554. |
Parent taxa | ||
Subordinate taxa | ||
Synonyms | Hesperis africana, Malcolmia africana | |
Name authority | Boissier: Diagn. Pl. Orient. 3(1): 22. (1854) | (Linnaeus) Botschantzev: Bot. Zhurn. (Moscow & Leningrad) 57: 1038. (1972) |
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