130026 TALL ROCKET Sisymbrium altissimum (Brassicaceae) Height to 2m. Upright annual of waste ground; hairless above but hairy below. Flowers 1cm across, yellow petals, twice the length of sepals (June-Aug). Fruits slender, narrow and up to 10cm long. Leaves have very narrow lobes, Status introduced but established in S and E England. Eastern Rocket S. orientale is similar but with smaller flowers and divided leaves that are spear-shaped overall. Waste ground in S.