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Calepina irregularis

Calepina irregularis (Asso) Thell.  
Family: Brassicaceae
White Ball-Mustard
[Calepina corvini (All.) Desv., moreCochlearia auriculata Lam.]
Calepina irregularis image
  • FNA
  • Gleason & Cronquist
  • Resources
Ihsan A. Al-Shehbaz in Flora of North America (vol. 7)
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.

Flowering Mar-May. Fields, waste places, roadsides; 0-200 m; 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.

Vascular plants of NE US and adjacent Canada
A glabrous European annual or biennial with a lax raceme, unequal pet, and rugose frs, is casually intr. in Va. and N.C. The cauline lvs are clasping, with acute, patent auricles.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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