Calepina irregularis

(Asso) Thellung

in H. Schinz and R. Keller, Fl. Schweiz ed. 2, 1: 218. 1905.

Basionym: Myagrum irregulare Asso Syn. Stirp. Aragon., 82. 1779
Synonyms: Calepina corvini (Allioni) Desvaux Crambe corvini Allioni
Treatment appears in FNA Volume 7. Treatment on page 446.

Stems several from base, (1–)2–8 dm, unbranched or branched distally. Basal leaves early rosulate; petiole (0.2–)1–3.5(–6) cm; blade obovate, spatulate, or oblanceolate, (0.8–)2–5(–9) cm × (3–)10–30 mm, base attenuate. Cauline leaves: blade oblong to lanceolate, (1–)2–7(–8) cm × (4–)10–20(–30) mm, base sagittate or amplexicaul, apex obtuse to acute. Racemes with straight rachis. Fruiting pedicels straight or curved upward, (3–)5–10(–13) mm. Flowers: sepals oblong or ovate, 1.2–2 × 0.5–1 mm; petals (1.5–)2–3 × 0.5–1.5 mm, unequal, abaxial pair larger than adaxial (longer than sepals); filaments 1–1.5 mm; anthers ca. 0.3 mm; gynophore 0.1–0.2 mm. Fruits 2.5–3.5(–4) × 2–3 mm, abruptly tapering to a conical, beaklike apex, 0.5–0.8 mm. Seeds brown, 1.3–1.6 mm. 2n = 14, 28.

Phenology: Flowering Mar–May.
Habitat: Fields, waste places, roadsides
Elevation: 0-200 m


V7 675-distribution-map.gif

Introduced; Md., N.C., Va., Europe, c, sw Asia, n Africa.


The fruits of Calepina irregularis and Neslia apiculata are remarkably similar; the two can easily be separated by the presence of white instead of yellow petals and by the absence of indumentum in Calepina.

Selected References


Lower Taxa

... more about "Calepina irregularis"
Ihsan A. Al-Shehbaz +
(Asso) Thellung +
Myagrum irregulare +
Md. +, N.C. +, Va. +, Europe +, c +, sw Asia +  and n Africa. +
0-200 m +
Fields, waste places, roadsides +
Flowering Mar–May. +
in H. Schinz and R. Keller, Fl. Schweiz ed. +
Introduced +  and Illustrated +
Calepina corvini +  and Crambe corvini +
Calepina irregularis +
Calepina +
species +