Tordylium species are
annuals or
biennials, covered in long hairs. Their stems may be hollow or almost solid. The basal leaves are more-or-less undivided, and have usually disappeared when the plant flowers. The stem leaves are once
pinnate. The flowers have persistent
sepals and white
petals, with those on one side much longer than the other. The fruits are about as long as they are wide. Their side ridges have whitish wings. ==Taxonomy==