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Aegean wallflower, common wallflower, European wallflower, wallflower

European wallflower, wormseed mustard

Habit Biennials or subshrubs. Biennials.
Stems

erect, unbranched or branched distally, (woody at base when subshrubs), 1.5–8 dm.

erect, often branched distally, (slightly ribbed), (1–)3–9(–11) dm.

Basal leaves

(rosulate when biennial, often withered by fruiting), similar to cauline.

(withered by fruiting; petiole 1–4 cm);

blade elliptic-oblong or oblanceolate, (1–)2–6(–8) cm × (0.3–)5–10 mm, base cuneate, margins entire or obscurely denticulate, apex acute.

Cauline leaves

petiolate;

blade (obovate to oblanceolate, 4–22 cm × 3–12 mm, base cuneate to attenuate), margins entire to repand.

sessile or subsessile;

blade (linear or elliptic-linear), margins entire or obscurely denticulate.

Racemes

considerably elongated in fruit.

considerably elongated in fruit.

Flowers

sepals oblong, 6–10 mm, lateral pair not or slightly saccate basally;

petals orange, yellow, brown, red, purple, violet, or white, broadly obovate to suborbicular, 20–35x 5–10 mm, claw 7–12 mm, apex rounded;

median filaments 7–9 mm;

anthers linear, 2.5–3.5 mm.

sepals oblong, 4–7 mm, lateral pair not saccate basally;

petals yellow, obovate, (6–)7–9(–10) × 2–3 mm, claw 5–8 mm, apex rounded;

median filaments 4–6 mm;

anthers oblong, 1.5–2 mm.

Fruiting pedicels

divaricate-ascending to ascending, slender, narrower than fruit, 7–13 mm.

suberect or ascending, slender, narrower than fruit, (3–)4–8(–10) mm.

Fruits

ascending, narrowly linear, straight, not torulose, 3–10 cm × 2–7 mm, latiseptate to terete, not striped;

valves with prominent midvein, pubescent outside, trichomes 2-rayed, glabrous inside;

ovules 32–44 per ovary;

style cylindrical or subconical, slender, 0.5–4 mm, pubescent;

stigma strongly 2-lobed, lobes much longer than wide.

erect, (often appressed to rachis), linear, straight, somewhat torulose, (1–)1.5–2.5(–4) cm × 1–1.3 mm, 4-angled, not striped;

valves with prominent midvein, pubescent outside, trichomes 3- or 4-rayed, fewer 2-rayed ones, usually glabrous inside, rarely sparsely pubescent;

ovules 40–60 per ovary;

style cylindrical, slender, 0.5–2 mm;

stigma capitate, entire.

Seeds

ovate, 2–4 × 1.5–3 mm;

wing continuous or distal.

oblong, 1–1.5 × 0.4–0.6 mm;

not winged.

Tri

-chomes of leaves 2-rayed, rarely mixed with fewer 3-rayed ones apically.

Trichomes

of leaves mostly 3- or 4-rayed, 2-rayed ones usually on stem and pedicel.

2n

= 12.

Erysimum cheiri

Erysimum hieraciifolium

Phenology Flowering Apr–Jul. Flowering Jun–Sep.
Habitat Disturbed sites, lawns, abandoned gardens Moist areas, disturbed sites, grasslands, roadsides, waste ground
Elevation 0-1500 m (0-4900 ft) 50-300 m (200-1000 ft)
Distribution
from FNA
CA; BC; QC; YT; Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
MA; VT; WI; MB; NB; NS; ON; QC; SK; Eurasia [Introduced in North America]
[BONAP county map]
Discussion

Erysimum cheiri is a widely cultivated ornamental of European origin.

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

Source FNA vol. 7, p. 539. FNA vol. 7, p. 540.
Parent taxa Brassicaceae > tribe Erysimeae > Erysimum Brassicaceae > tribe Erysimeae > Erysimum
Sibling taxa
E. ammophilum, E. arenicola, E. asperum, E. capitatum, E. cheiranthoides, E. coarctatum, E. concinnum, E. franciscanum, E. hieraciifolium, E. inconspicuum, E. insulare, E. menziesii, E. occidentale, E. pallasii, E. perenne, E. repandum, E. suffrutescens, E. teretifolium
E. ammophilum, E. arenicola, E. asperum, E. capitatum, E. cheiranthoides, E. cheiri, E. coarctatum, E. concinnum, E. franciscanum, E. inconspicuum, E. insulare, E. menziesii, E. occidentale, E. pallasii, E. perenne, E. repandum, E. suffrutescens, E. teretifolium
Synonyms Cheiranthus cheiri
Name authority (Linnaeus) Crantz: Cl. Crucif. Emend., 116. (1769) Linnaeus: Cent. Pl. I, 18. (1755)
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