Coincya monensis subsp. cheiranthos Wallflower Cabbage

An erect, sometimes somewhat bushy, yellow-flowered crucifer of waste ground and disturbed grassy places. In Britain, it is most common near the coast in south Wales with a sparse and patchy distribution elsewhere where it tends to be casual and it is absent from Ireland. It is a larger plant than Isle of Man Cabbage (Coincya monensis subsp. monensis) and usually more coarsly hairy (hispid) especially above and in the inflorescence but is frequently confused with it. It is tetraploid (2n=48) but will cross with the diploid Isle of Man Cabbage (2n=24) to produce largely infertile hybrids. Most populations in West Glamorgan , which are annual or biennial, produce large amounts of seed in most years and it is fairly persistent on sand dunes (e.g. Crymlyn Burrows) and waste places in and around Swansea and Neath. It is rare west of Swansea City and very rare in Gower. It can be confused with Perennial Wall-rocket (Diplotaxis tenuifolia), which grows in similar places but that species has a strong smell (almost like rubber or rocket salad) when the leaves are crushed.

Neophyte