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strigosella

African mustard

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].

Basal leaves

soon withered.

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.

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.

2n

= 14, 28.

Strigosella

Strigosella africana

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]
[BONAP county map]
from FNA
AZ; CA; CO; ID; MT; NV; OR; UT; WY; Europe; Asia; n Africa [Introduced in North America; introduced also in South America (Argentina)]
[WildflowerSearch map]
[BONAP county map]
Discussion

Species 20 (1 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 553. Author: Ihsan A. Al-Shehbaz. FNA vol. 7, p. 554.
Parent taxa Brassicaceae > tribe Euclidieae Brassicaceae > tribe Euclidieae > Strigosella
Subordinate taxa
S. africana
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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