Identification
This naturalized annual or biennial was introduced from Europe. A weedy species, the many branched stem grows up to 2 feet tall, with larger, oblong leaves at the bottom, and smaller, thin leaves nearer the top (B). The very small, sometimes barely visible, white 4 petaled flowers grow in numerous terminal clusters (B.D). Small (1/6 inch) nearly round, slightly notched seed pods (silicles) develop below the elongating flower clusters (C,D,E). For details on separation of this species from other small mustards, see Comments below.
This weed grows on roadsides and other disturbed ground at both Fontenelle Forest and Neale Woods. Flowering occurs from April through July.
The small, nearly round seed pod differentiates this plant from other similar mustards. Shepherd’s Purse (Capsella bursa-pastoris) has a triangular, deeply notched seed pod; Pennycress (Thlaspi arvense) also has a round pod, but it is larger and more deeply notched.
Mustard oils in the seeds, which give them a peppery taste, are responsible for the common name.
The content of NatureSearch is provided by dedicated volunteer Naturalists of Fontenelle Forest who strive to provide the most accurate information available. Contributors of the images retain their copyrights. The point of contact for this page is: Roland Barth.