1.
Calepina irregularis
(Asso) Thellung in H. Schinz and R. Keller, Fl. Schweiz ed. 2. 1: 218. 1905.
Myagrum irregulare
Asso, Syn. Stirp. Aragon., 82. 1779;
Calepina corvini
(Allioni) Desvaux;
Crambe corvini
Allioni
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.
2
n
= 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
.
