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The flowers, which appear in May and June, are 3⁄8 in. in width, in flat-topped panicles, with purplish sepals and white petals; the fruit is a small silicula, which does not ripen in the climate of England.

When the fruit is several times longer than broad it is known as a siliqua, as in stock or wallflower; when about as long as broad, a silicula, as in shepherd’s purse.

The partition is narrow, hence the silicula is angustiseptal.

On the lower part of the corymb were several seed vessels on pedicels changed from their usual linear to an ovate elliptical figure, so as to resemble a silicula.

Silicula integra, ovali-oblonga: valvis planiusculis, dissepimento parallelis.