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Hedge mustard flowers occur at the tips of long, slender flower stalks that curve upward; the flower stalks typically arise in abundance at the top of the plant. Each flower is small (1/4" across) with four greenish-yellow sepals, four rectangular yellow petals with rounded tips, a single stout style, and six stamens. The fruit is a very slender, cylindrical seedpod (silique) lower on the flower stalk than the blooming flowers; the siliques are 3/8-3/4" long, erect, oriented parallel to and often appressed to the flower stalk, with the remains of the style on their tips. The siliques turn light brown when mature and split open to release the seeds. The short (<3/4"), straight, appressed seedpods and the upward-curving, sparse flower stalks with only a few blooms open at any one time distinguish hedge mustard from other local mustards.

Sisymbrium

Sisymbrium officinale

hedge mustard [Blooms: May-Jul]